选择题:With the help of high technology, more and more ne

题目内容:
With the help of high technology, more and more new substances ______ in the past years.
A、 discovered
B、 have discovered
C、 had been discovered
D、 have been discovered
参考答案:

57. (多选题) 偏心受压构件按破坏特征分为 。(本题1.0分)A、 大偏心构件B、 小偏心构件C

57. (多选题) 偏心受压构件按破坏特征分为 。(本题1.0分)A、 大偏心构件B、 小偏心构件C、 偏心构件D、 都不正确

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