题目内容

牛顿环是利用薄膜干涉的原理，获得相干光的办法是分波面。

A. 对
B. 错

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The 12 animal figures of the Chinese calendar exclude ________________

A. the goat.
B. the rabbit.
C. the pig.
D. the cat.

The cat failed to be chosen as one of the 12 animal figures because he was _____________

A. lazy
B. late
C. slow
D. cheated by the rat

连铸生产中的质量指标有哪几个？

连铸生产中质量指标有哪几个？