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【单选题】
可逆控制电路需要增加（ ）电气结构，以确保电路安全。A.
自锁控制
B.
互锁控制
C.
联锁控制
D.
多地控制
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反馈参考答案：
举一反三
【简答题】某省机械厂生产纺织机械,目标顾客是全国纺织企业。根据产品性质,销售范围及媒介特点,应选择的广告媒介是( )。
【单选题】根据短文的内容，回答下列题目 Global Warming (1) Smoke is clouding our view of global warming, protecting the planet from perhaps three-quarters ofthe greenhouse (温室) effect. That might sound like good news, but exp...
A.
Atmospheric scientists
B.
The calculations made at the berlin workshop
C.
The previous calculations of the effect of aerosols
D.
The scientists' agreement
E.
The authoritative conclusion
F.
Greenhouse gases
【单选题】Only a very few great inventors ______ in history.
A.
will be recorded
B.
recording
C.
being recorded
D.
to recorded
【单选题】听力原文： Thomas Edison is a well known American inventor. He was taught by his mother when he was a child. Later he learned things by himself by reading and experimenting. He built a lab for himself to w...
A.
He went to a famous school.
B.
He was taught by his mother.
C.
His parents employed a good teacher to teach him.
D.
He was taught by his father.
【单选题】根据以下材料，回答题 Global Warming （1） Smoke is clouding our view of global warming， protecting the planet from perhaps three-quarters of the greenhouse （温室） effect. That might sound like good news， but expert...
A.
Atmospheric scientists
B.
The calculations made at the berlin workshop
C.
The previous calculations of the effect of aerosols
D.
The scientists' agreement
E.
The authoritative conclusion
F.
Greenhouse gases
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