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提问人：网友sff2008 发布时间：2022-01-07

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In an underground limestone mine, samplers were placed in the immediate intake and return

of an underground crusher to determine the amount of dust liberated during the dumping/crushing of the limestone.

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第1题

【填空题】MPEG-1 is designed to compress VHS-quality raw digital video and CD audio down to __________ Mbit/s (26:1 and 6:1 compression ratios respectively) without____________________.

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第2题

The budget line

A、determines an individual’s optimal consumption basket.

B、will not shift at all if the prices of both commodities increase and income is unchanged.

C、determines an individual’s possible consumption baskets.

D、is a straight line whose slope is given by the rate of inflation.

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第3题

Joe is a computer service technician. People in his neighborhood usually depend on his suggestions for purchasing any computer accessory or hardware, as they believe that he has access to far more information on computer technology than the average consumer. The neighbors are also aware that Joe has the required knowledge and background for understanding the technical properties of the products. Within this context, Joe can be called a(n) ________.

A、transactional leader

B、opinion leader

C、role model

D、gate-keeper

E、international marketer

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第4题

What are the principle of operation?

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第5题

Methane and air explosions occur in the well-known mixture range of 5% to ( )% methane in air.

A、10

B、15

C、20

D、25

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第6题

Flaming combustion of all kinds is extinguished at oxygen contents of 10 to 12 per cent while smouldering is usually terminated at oxygen concentrations below （）per cent.

A、1

B、2

C、3

D、4

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第7题

To put these flammability limits into perspective, it should be recalled that threshold limit values for respirable coal dust concentrations can be as low as （）milligrams per cubic metre.

A、1

B、2

C、3

D、4

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