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提问人:网友lemonilove 发布时间:2022-01-07
[主观题]

B has only three valence electrons. When it substitutes for a Si atom one of its bonds has an electron missing and therefore a hole.

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更多“B has only three valence electrons. When it substitutes for a Si atom one of its bonds has an electr…”相关的问题
第1题
【单选题】Besides Met, which amino acid has ONLY one codon ()

A.Trp

B.Pro

C.Val

D.Arg

E.His

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第2题
California is a land of variety and contrast. Almost every type of physical land feature,
sort of arctic ice fields and tropical jungles can be found within its borders. Sharply contrasting types of land often lie very close to one another. People living in Bakersfield, for instance, can visit the Pacific Ocean and the coastal plain, the fertile San Joaquin Val!ey, the ar id Mojave Desert, and the high Sierra Nevada, all within a radius of about 100 miles. In other areas it is possible go snow skiing in the morning and surfing in the evening of the same day, without having to travel long distance.

Contrast abounds in California. The highest point in the United States (outside Alaska ) is in California, and so is the lowest point (including Alaska). Mount Whitney, 14,494 feet above sea level, is separated from Death Valley, 282 feet below sea level, by a distance of only 100 miles. The two areas have a difference in altitude of almost three miles.

California has deep, clear mountain lakes like Lake Tahoe, the deepest in the country, but it also has shallow, salty desert lakes. It has Lake Tulainyo, 12,020 feet above sea level, and the lowest lake in the country, the Salton Sea, 236 feet below sea level. Some of its lakes, like Owens Lake in Death Valley, are not lakes at all: they are dried-up lake beds.

In addition to mountains, lakes, valleys, deserts, and plateaus, California has its Pacific coastline, stretching longer than the coastlines of Oregon and Washington combined.

Which of the following is the lowest point in the United States?

A.Lake Tulainyo.

B.Mojave desert.

C.Death Valley.

D.The Salton Sea.

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第3题
Why has the ISS now had only three crew members?A.Because the Russian Soyuz capsules can't

Why has the ISS now had only three crew members?

A.Because the Russian Soyuz capsules can't manage more.

B.Because the ISS has only enough room for three people.

C.Because three people are quite enough to run the ISS.

D.Because NASA commissions report to limit the number to three.

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第4题
According to the passage, California has the highest rate of returning prisoners because
[A] the prisons in California are too crowded. [B] the prisons failed to rehabilitate the prisoners. [C] the prisoners can sleep in the gymnasiums and classrooms. [D]] the prisoners are released after only three years of imprisonment.

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第5题
He is the only one of the students who()abroad for three years

A.is

B.are

C.have been

D.has been

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第6题
He is the only one of the students who _____ a winner of scholarships for three years()

A.is

B.are

C.have been

D.has been

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第7题
The main idea of Paragraph Three is that ______.A.workers now take examinationsB.the popul

The main idea of Paragraph Three is that ______.

A.workers now take examinations

B.the population has grown

C.there are only written exams today

D.examinations are now written and timed

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第8题
among the following three american writers, only one has never been married in his or

A. the person is ___.

B. Edgar Ellan Poe

C.Herman Melville

D.Emily Dickinson

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第9题
听力原文:M: Has John come back from Europe?W: Yes, but he was only in America for three da

听力原文:M: Has John come back from Europe?

W: Yes, but he was only in America for three days before his company sent him to Canada.

Where is John now?

A.In Canada.

B.In China.

C.In Europe.

D.In America.

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第10题
5 An enterprise has made a material change to an accounting policy in preparing its curren
t financial statements.

Which of the following disclosures are required by IAS 8 Accounting policies, changes in accounting estimates

and errors in these financial statements?

1 The reasons for the change.

2 The amount of the consequent adjustment in the current period and in comparative information for prior periods.

3 An estimate of the effect of the change on future periods, where possible.

A 1 and 2 only

B 1 and 3 only

C 2 and 3 only

D All three items

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