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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A.diesel oil instead of fuel oil
B.fuel oil instead of diesel oil
C.diesel oil instead fuel oil
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A.the “ nip ”is zero
B.the “ nap ” is zero
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In （）the control action is independent on the output.
A.a closed loop control system
B.an open loop control system
C.a boiler control system
D.a steering gear
