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【单选题】
关于有源逆变和无源逆变，下面说法正确的（）。A.
无源逆变指的是把直流电能转变成交流电能回送给电网
B.
有源逆变指的是把直流电能转变成交流电能送给负载
C.
应急电源中将直流电变为交流电供灯照明，其电路中发生的“逆变”称有源逆变
D.
光伏逆变中，将直流电变为交流反馈回电网，其“逆变”称有源逆变
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【单选题】The word 'retrospective' is made up of three morphemes. Which of them is a root?
A.
retro-.
B.
spect.
C.
-ire.
D.
trospec.
【单选题】— In my opinion, China has more ______ to deal with the disease of A/H1N1. — I quite agree with you. Chinese medicine works well. [ ]
A.
advantages
B.
interests
C.
equipments
D.
materials
【单选题】What causes the tension that draws water up a plant?
A.
Humidity
B.
Plant growth
C.
Root pressure
D.
Evaporation
【单选题】It is futile to argue with him once he has made up his mind.
A.
unpleasant
B.
encouraging
C.
helpful
D.
useless
【单选题】Is it, in your opinion, possible _____ new measures will be taken to improve the terrible traffic? [ ]
A.
whether
B.
what
C.
when
D.
that
【单选题】—John, why just stand there with your mouth closed? You are expected to air your opinion. —________.You have another supporter in me.
A.
I'm with you on that
B.
I'm through
C.
Nonsense
D.
Hold your tongue
【单选题】Is it acceptable to give your personal opinion in an academic paper?
A.
Yes, it is always acceptable to give your personal opinion.
B.
Yes, but only if it is specifically asked for.
C.
No, never.
D.
Yes, but only if you present the ideas of others as well.
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