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單項(xiàng)選擇題

Remote control means that the system is being controlled by the operator who is situated （） from the system.

A.automatic
B.local
C.remote
D.manual

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單項(xiàng)選擇題

Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.

A.make sure
B.be sure
C.assure
D.believe

單項(xiàng)選擇題

Pumps and fine filters are arranged （） with one as standby.

A.in duplicate
B.in double
C.at twice
D.for two