罩式炉进行气体保护的设备是（）。 A.加热罩 B.冷却 C.内罩 D.终冷台_爱下问搜题

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问题单项选择题

罩式炉进行气体保护的设备是（）。

A.加热罩

B.冷却

C.内罩

D.终冷台

答案

参考答案：C

选择题

_____ he referred to in his article was difficult to understand.

A. What
B. Which
C. That
D. Who

选择题

—Could you please tell me _____?

—Go upstairs and turn left.

A. what is the teacher's office

B. what the teacher's office is

C. where is the teacher's office

D. where the teacher's office is