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提问人：网友gaofengwen 发布时间：2022-01-07

[单选题]

The rule also sets forth the mine operator’s obligations, including respirable dust sampling requirements for Part （) miners.

A.10

B.30

C.60

D.90

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· 有3位网友选择 B，占比33.33%
· 有3位网友选择 C，占比33.33%
· 有2位网友选择 A，占比22.22%
· 有1位网友选择 D，占比11.11%

ABCD

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第1题

Although she was totally ______, she was chosen over more than a thousand other actresses for a role in "Superman. " (experience)

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第2题

Television ,the modern wonder of electronics，brings the world into your own home in sight and sound,1. And the word "television" means "seeing far".

Television works in much the same way as radio. In radio，sound is changed into electromagnetic (invisible light) waves which are sent through the air. Experiments leading to modern television took place more than a hundred years ago. By the 1920s inventors and researchers had turned the early theories into working models.Yet it took another thirty years for TV to become an industry.

The influence of TV on the life of people is incalculable：it can influence their thoughts and their way of life. It can also add to their store of knowledge. Educational TV stations offer teaching in various subjects. Some hospitals use TV for medical students to get close-up views of operations. At first television programs were broadcast in black-and -white. With the development of science and technology，the problem of how to telecast them in full color was solved and by the middle 1960s the national networks were broadcasting most of their programs in color.

The programs that people watch are not only local and national ones. Since the launching of the first communications satellite，more and more programs are telecast "live" from all over the world. People in San Francisco were able to watch the 1964 Olympic Games in Tokyo. And live telecasts now come from outer space. In 1969，the first astronauts to land on the moon televised their historic "moon walk" to viewers on the earth. Since then，astronauts have regularly sent telecast to the earth.

56. Television is said to be the modern wonder of electronics，because _______.

A. it is an industry

B. it broadcasts most of the programs in color

C. it brings the world into people's own home in sight and sound

D. it influences people's thoughts

57. Television became an industry in _______.

A. 1920

B. 1969

C. the l920s

D. the 1950s

58. The word "incalculable" means______.

A. very great

B. uncertain

C. hard to tell

D. very small

59. The development of science and technology made it possible for television programs to _______.

A. be telecast again

B. be kept for later use

C. be put on video tape

D. be telecast in full color

60. The launching of communications satellites made it possible for people to _______.

A. get close up views of operations

B. learn various subjects

C. watch the 1964 Olympic Games in Tokyo

D. watch local programs

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第3题

The U.S. birthrate began to decline in the middle 1950's, resulting in a smaller College age population starting in the middle 1970's. Something else happened in the 1970's: the price of oil increased tremendously, driving up the price of almost everything and making Americans aware that their large automobiles used a lot of gasoline. At the same time, foreign car manufacturers had begun to produce small fuel efficient cars in large quantities for the export market. Suddenly, the large, gas guzzling American cars were no longer attractive to American buyers, who began buying foreign cars by the thousands. The American automobile industry went into a recession. Thousands of automotive workers were laid off, as were thousands of people in industries indirectly connected with the auto industry. People who are laid off tend to keep what money they have for necessities, like food and housing. They do not have the extra money needed to send their children to college. Their children cannot pay their own college costs, because during a recession they cannot find jobs. High unemployment means that more state funds must be used for social service—unemployment benefits and to aid dependent children, for example—than during more prosperous times. It also means that the states have fewer funds than usual, because people are paying fewer taxes. Institutions of higher education depend on two major sources of income to keep them functioning: tuition from students and funds from the states. At the present time, there are fewer students than in the past and fewer state funds available for higher education. The colleges and universities are in trouble.

What is the main idea of this passage?

A．The rising of oil price drove up the price of everything.

B．There were many reasons why higher education was in trouble in the 1970's.

C．Birthrate began to decline in the U.S.A. in 1950's.

D．High unemployment caused a lot of social problems.

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第4题

10. Computed tare is a tare previously agreed upon by the seller and the buyer.

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第5题

What makes it rain? Rain falls from clouds for the same reason anything falls to Earth. The Earth's Gravity(重力) pulls it. But every cloud is made of water droplets or ice crystals. Why doesn't rain or snow fall constantly from all clouds? The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.

Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft(束) of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about wildly without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The cloud droplet of average size is only 1/2,500 inch in diameter. (78)It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of moving air at all. Only when the droplet grows to a diameter of 1/125 inch or larger can it fall form. the cloud. The average raindrop contains a million times as much water as a tiny cloud droplet. The growth of a cloud droplet to a size large enough to fall out is the cause of rain.

What is the main topic of the passage?

A．The mechanics of rain.

B．The climate of North America.

C．How gravity affects air current.

D．Types of clouds.

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第6题

Which description is right to describe outliers?

A、Outliers caused by measurement error

B、Outliers reflecting ground truth

C、Outliers caused by equipment failure

D、Outliers needed to be dropped out always

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第7题

Tetralogy of Fallot is a cardiac malformation that involves which of the following septa?

A、Aorticopulmonary septum

B、Atrial septum

C、Atrioventricular septum

D、Interventricular septum

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第8题

Workers in some aboveground coal mining operations also have increased exposure to coal mine dust.

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第9题

Treatment types including: .

A、Windblown dust

B、Volcanic ash and gases

C、Smoke and fly ash from forest fires

D、Pollens and other aeroallergens

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第10题

Natural sources include (but are not limited to): .

A、Windblown dust

B、Volcanic ash and gases

C、Smoke and fly ash from forest fires

D、Pollens and other aeroallergens

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