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【单选题】
Which one of the following material can not be used for insulating and arc extinguishing in a high voltage circuit breaker?A.
Electric insulating oil.
B.
Vacuum
C.
Sulfur hexafluoride.
D.
Carbon dioxide.
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举一反三
【单选题】Which sentence has a different meaning?
A.
Every student studying here has access to the campus library .
B.
The campus library is accessible to every student studying here .
C.
The campus library is inaccessible to students who are studying here.
D.
Every student studying here can enter and use the campus library .
【简答题】No erous goods are allowed to ______________ on the train!
【单选题】Which sentence has a mistake in it?
A.
As a grown girl, you should depend on yourself to make a choice for your future.
B.
As a grown girl, you should be independent on yourself to make a choice for your future.
C.
As a grown girl, you should be dependent on yourself to make a choice for your future.
D.
As a grown girl, you should have dependence on yourself to make a choice for your future.
【简答题】No erous goods ______________ allowed to bring on the train!
【简答题】θ 为接触角,当 时,液体不能润湿固体。
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