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【单选题】
波分复用( WDM )是光通信的复用技术,其原理与下列一种复用方式类似,该( )。A.
码分复用
B.
时分复用
C.
空分复用
D.
频分复用
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反馈参考答案：
举一反三
【单选题】We must face the fact __________ our time is limited and we must cherish every minute.
A.
which
B.
on which
C.
that
D.
Why
【单选题】In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be （）.
A.
craned out
B.
rolled out
C.
lifted out
D.
turned out
【单选题】Belief We all believe in something or someone. We must believe, just as we must eat, sleep, and reproduce. Mankind has an insatiable need for and an irresistible attraction to a vast array of beliefs ...
A.
Faith.
B.
Trust.
C.
Security.
D.
Hope.
【简答题】The children are all Y__________________ Pioneers．
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