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【单选题】
光纤的通信窗口是A.
850nm
B.
1310nm
C.
155nm
D.
以上都是
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举一反三
【单选题】— What is Tom doing now? — He is _____ at the moment. [ ]
A.
sleep
B.
sleeps
C.
to sleep
D.
sleeping
【单选题】What is Tom doing now? He is preparing a report for the conference tomorrow.
A.
held
B.
being held
C.
to be held
D.
having been held
【简答题】TCP/IP协议族是一个四层协议系统,自底向上依次为数据链路层、网络层、______层与_____层。其中,HTTP协议属于________层协议,除HTTP协议外,处于同一层次的常用协议还有HTTPS、FTP、SMTP等。
【单选题】听力原文：M: My telephone doesn't seem to be working. And I have lots of calls that I have to return this afternoon. W: Feel free to use mine if you want I'll be in a meeting till five. Q: What does the wo...
A.
Call her after five.
B.
Make calls from her phone.
C.
Go to the meeting with her.
D.
Fix his phone.
【简答题】转氨基作用和脱羧基作用,虽然作用不同,但具有相同的辅酶为( )
【单选题】What are you doing out of bed, Tom? You're to be asleep. ,
A.
supposed
B.
known
C.
thought
D.
considered
【单选题】2-26.使刀具或工件运动到所需角度或位置，用于加工若干个完全相同的沿圆周均匀分布表面的运动，属于（ ）。
A.
空行程运动。
B.
切入、切出运动。
C.
分度运动。
D.
操纵及控制运动。
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