题目内容

影象的原型是实物。

A. 正确
B. 错误

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晶体二极管构造及用途?

I appreciate()the opportunity to visit your factory.

A. having been given
B. to have been given
C. having given
D. to have given

钢中的氮可使钢材产生(),使钢的冲击韧性降低。

球团矿的堆密度一般在()之间。

A. 1.5t/m3~1.7t/m3
B. 1.6t/m3~1.8t/m3
C. 1.9t/m3~2.0t/m3
D. 1.8t/m3~1.9t/m3

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