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單項(xiàng)選擇題

A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.

A.check valve
B.non-return valve
C.steam trap
D.quick closing trap

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單項(xiàng)選擇題

Fuel oil tanks must be fitted with （） that can be closed rapidly and remotely in the event of an emergency such as a fire.

A.stop valves
B.non-return valves
C.quick closing valves
D.relief valves

單項(xiàng)選擇題

A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.

A.a pressure reducing valve
B.a pilot valve
C.an operating piston
D.downstream pressure

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