单项选择题

Speaker A: Hello. Customer Service. What can I do for you?
Speaker B: Yes. There’s something wrong with my electric oven. It doesn’t work now.
Speaker A: All right. May I have your telephone number and address?
Speaker B: （）

A．I beg your pardon.
B．What do you need?
C．Sure. Here you are.
D．Please just forgive me.

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若离心泵人口处真空表读数为93．32kPa，当地大气压强为101．33kPa，则输送42℃水(饱和蒸汽压为8．2kPa)时，则泵内（）发生汽蚀现象。

Speaker A: Hello. Customer Service. What can I do for you?Speaker B: Yes. There’s something wrong with my electric oven. It doesn’t work now.Speaker A: All right. May I have your telephone number and address?Speaker B: （）