【单选题】【消耗次数：1】
SF6断路器的灭弧和绝缘介质为（）。
①
绝缘油
②
真空
③
空气
④
六氟化硫气体
参考答案：
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【判断题】
在少油式断路器中，油只用来灭弧而不作绝缘用载流部分的绝缘是利用空气和陶瓷等绝缘材料。在多油式断路器中，油不仅作为灭弧介质，同时兼作带电部分之间和带电部分对地之间的绝缘，所以用油量较多。
①
正确
②
错误
【单选题】
关于油断路器，下列说法中正确的是（）。??
①
只有少油断路器的油仅作为灭弧介质来用??
②
无论是多油断路器，还是少油断路器它们的油都只作为灭弧介质来用?
③
无论是多油断路器，还是少油断路器它们的油不但作为灭弧介质来用，还作为绝缘介质来使用。
④
只有多油断路器的油仅作为灭弧介质来用?
随机题目
【单选题】
People under stress have performed _____feats of strength, like lifting an automobile off an accident victim.
①
specific
②
extraordinary
③
abrupt
④
abnormal
【单选题】
Operations which left patients _____and in need of long periods of discovery time now leave them feeling relaxed and comfortable.
①
exhausted
②
unhealthy
③
upset
④
fearful
【单选题】
Outside my office window there is a fire _____on the right.
①
escape
②
ladder
③
steps
④
stairs
【单选题】
The fox fell into the _____the hunter had set for it.
①
bush
②
trap
③
trick
④
circle
【单选题】
You should know better than _____your little sister at home by herself.
①
to leave
②
leaving
③
to have left
④
left
【单选题】
The reason that his property was confiscated by the country, it _____, was that he was involved in a lot of fraudulent activities during the war.
①
was turned out
②
was being turned out
③
being turned out
④
turned out
【单选题】
By the end of next month we _____this assignment.
①
will finish
②
will be finishing
③
will have finished
④
have finished
【单选题】
Our teacher recommended that we _____as attentive as possible when we visit the museum.
①
are
②
shall be
③
be
④
were
【单选题】
_____native to North America, corn has now spread all over the world.
①
In spite of
②
That it is
③
It was
④
Although
【单选题】
Televisions enable us to see things happen almost at the exact moment _____.
①
which they are happening
②
they are happening
③
which they happen
④
they have happened