题目内容

How did Craig Venter defend his company’s behavior

A. He was collecting information to sell to scientists
B. The pace of genetic research became very slow because of competition
C. The information collected by him would be given to government free of charge.

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下列哪一点是判断化合物结晶纯度的标准之一

A. 化合物的熔距在1～2℃
B. 化合物的熔距在2～3℃
C. 沸点一致
D. 溶解度一致
E. 灼烧后无残渣

环烯醚萜属于

A. 单萜
B. 倍半萜
C. 二萜
D. 三萜
E. 挥发油

Future communities should be planned with transportation efficiency as a major consideration.

Railways and airlines want to win passengers from each other.