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【单选题】
处于高频状态时，（）是电力电子器件功率损耗的主要成因。A.
开关损耗
B.
通态损耗
C.
断态损耗
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】There is ______ on Channel 6, please try to find it.
A.
important something
B.
something important
C.
important anything
【单选题】听力原文：W: Let's try to find seats in the front. M: Listen, we'll be lucky to find a place to stand at this concert. Q: What does the man mean? (16)
A.
He can't find the tickets.
B.
He doesn't want to sit in the front.
C.
He would rather stand than sit down.
D.
He expects the hall to be crowded.
【单选题】Please read the story carefully and try to _____ the answers. [ ]
A.
look
B.
see
C.
look for
D.
find out
【简答题】各级人民政府应当优先（ ）节能、节水、废物再生利用等有利于环境与资源保护的产品A. 采购
【单选题】Usually, trade fairs can only be attended by _____ and members of the press.
A.
company representatives
B.
the public
C.
customers
D.
everyone
【简答题】As we know, animals are our friends. Please read the following descriptions and try to find out what kinds of animals they are. Hi! I am Molly. I am twelve years old. I 46 from Africa. I like to play ...
【单选题】Please look over your paper carefully to ______ there are no mistakes. [ ]
A.
try out
B.
find out
C.
think of
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