题目内容

输入继电器(X)不可以当输出使用。

A. 对
B. 错

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衡量焊接性的指标有。

A. 流动性
B. 碳当量
C. 含碳的质量分数
D. 可锻性

下列材料中，的焊接性最好。

A. 铸铁
B. 铝合金
C. 低碳钢
D. 高合金钢

-Have you seen the film Lost In Thailand?-Oh,no.I my homework all day yesterday.

A. had done
B. did
C. have done
D. was doing

Nothing but some ancient Chinese coins in the sunken ship since they began the exploration.

A. has found
B. has been found
C. had been found
D. have been found