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【简答题】
自动空气开关的自由脱扣机构是一套连杆机构，当主触头闭合以后将主触头锁在合闸位置上。如果电路中发生故障，自由脱扣机构就在有关脱扣器的下动作，使钩子脱开。于是主触头在释放弹簧的作用下迅速分断。脱扣器有（）脱扣器、（）脱扣器、（）脱扣器与（）脱扣器。
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皮皮学刷刷变学霸
举一反三
【单选题】Kentucky is the state _________ Lincoln was born in.
A.
when
B.
where
C.
-who
D.
which
【简答题】Which state in America covers the largest territory?
【单选题】Which of the following can also be called as a swing state?
A.
a red state
B.
a purple state
C.
a blue state
D.
a safe state
【单选题】Which state is known as the capital of lobster?
A.
the State of Massachusetts
B.
the State of Washington
C.
the State of Texas
D.
the State of Maine
【单选题】Which of the following state is not slave-holding state in 1860?
A.
Georgia
B.
New York
C.
Tennessee
D.
Mississippi
【单选题】Which product costs the least money?
A.
Free Edition State.
B.
Deluxe State.
C.
Basic State.
D.
Premier State.
【单选题】The state of Washington, (which) entered the Union (in 1889), (was) named for honor (of) George Washington.
A.
which
B.
in 1889
C.
was
D.
of
【单选题】_______is said that________ tourists visit Geyuan Garden every day.
A.
It; thousands of
B.
It; five thousand of
C.
That; thousands of
D.
This; three thousand
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