单项选择题

The （）has a water damp ring.

A.purifier
B.oil/water separator
C.incinerator
D.distiller

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单项选择题

A.diesel oil instead of fuel oil
B.fuel oil instead of diesel oil
C.diesel oil instead fuel oil
D.fuel oil instead diesel oil

单项选择题

A.the “ nip ”is zero
B.the “ nap ” is zero
C.the “ gap ”is correct
D.the “ clearance ” is correct

单项选择题

A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear