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问题 单项选择题

正常生产中，以下（）种情况可以判断常压炉进料中断。

A.常压塔液面下降

B.常压炉各路进料为零

C.初侧线出黑油

D.常压炉出口温度及各分支温度升高

答案

参考答案：B

补全对话，情景问答

根据对话的语境和首字母提示，补全对话，使对话内容完整。

A: You don't look w____l____ tociay. Is there anything the  matter w____2____you?

B:I lost my job. But you see,my boss is crazy. He's not h____3____with anylhing I do.

A:It's really a b ____4____thing. Cheer up,Mary. You'll have better chances. By the w ____5____,did you see the ads in today's paper?They need a secretary.

B:Really? I'll t____6___it.

A:Good luck !
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填空题

产生电磁波的振荡电流频率为4×103KHZ，则这电磁波在空气中传播时的波长为 _________ m．
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