ITU-TG692建议DWDM系统的频率问隔为（）的整数倍。A.155Mfz B.1_爱下问搜题

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问题单项选择题

ITU-TG692建议DWDM系统的频率问隔为（）的整数倍。

A.155Mfz

B.100GHz

C.1OTHz

D.200GHz

答案

参考答案：B

补全对话，情景问答

给下列的问句选择对应的答语。

( ) 1. Where does the rain come from?
( ) 2. How can the water become vapour?
( ) 3. What are you going to do this afternoon?
( ) 4. Is your aunt an accountant?
( ) 5. Does he go to school on foot?

A. Yes, he does.
B. No, she isn't.
C. It comes from the clouds.
D. The sun shines and the water becomes vapour.
E. I'm going to plant flower seeds in the garden.

单项选择题

不寐实证，其病位多在：（）

A．心、脾、肝、肾

B．心、肝、小肠

C．心、肝、大肠

D．心、脾、肝、胃

E．肝、胃、大肠