题目内容

{1}等于酸值和酯值的和。

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分馏法适用于分离分子大小不同的化合物。

A. 对
B. 错

萜类化合物的结构通式为(C4H8)n

A. 对
B. 错

These people once had fame and fortune; now ____ is left to them is utter poverty. (2002.6.CET-4)

A. all what
B. all which
C. that all
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The reason I didn’t go to the meeting yesterday was ____ I had no interest in the topic.

A. because
B. due to
C. because of
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