题目内容

It is in college_______ you will truly discover what learning is about.

A. where
B. that
C. when

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It is time to focus ______ your college major and accumulate （v. 积累） additional knowledge.

A. to
B. on
C. in

下列牌号中哪个属于沸腾钢()

A. Q345B
B. 08F
C. W6Mo5Cr4V2A
D. 45

碳钢中的有益元素是_____、_；有害元素是_和_____。

渗碳用钢一般属于中碳钢。

A. 对
B. 错