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问题 判断题

柜台柜员的密码应定期更换，并妥善保管，不得随意透露、或交付他人使用，防止被盗用。（）

答案

参考答案：对

选择题
It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a couple of months.

A. has been developed
B. is being developed
C. is developing
D. has developed
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多项选择题

铝及铝合金管道安装中，其焊接方法可采用（）。

A.手工钨极氩弧焊

B.氧-乙炔焊

C.二氧化碳气体保护焊

D.熔化极半自动氩弧焊
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