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【单选题】
继电接触控制中使用的接触器、热继电器、时间继电器，在基于PLC的接线线路中，不再使用（ ）。A.
接触器
B.
热继电器
C.
时间继电器
D.
接触器和时间继电器
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举一反三
【单选题】使用中的氧气瓶和乙炔气瓶应()固定放置，氧气瓶和乙炔气瓶的距离不得小于5m，气瓶的放置地点不准靠近热源，应距明火l0m以外。
A.
水平
B.
倾斜
C.
并排
D.
垂直
【单选题】Why is a dog sitting before a computer keyboard in a cartoon published by New Yorkers?
A.
Even dogs are interested in the computer.
B.
E-mail has become very popular.
C.
Dogs are liberated from their usual duties.
D.
E-mail deprives dogs of their owners' love．
【单选题】Which of the following statements is TRUE?
A.
Only British citizen has access to the New York Teaching Fellows program.
B.
Candidates should have graduated from the City University of New York.
C.
It's not required to have full certification for the candidates.
D.
Most candidates will teach in the key schools of the city.
【单选题】The caller warned that the bomb would explode when the plane______.
A.
took off from New York
B.
arrived at Moscow
C.
left for Iceland
D.
reached Voronezh
【单选题】Which of the following city is located in Europe? ( )
A.
Bangkok
B.
Chicago
C.
New York
D.
Oslo
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