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


您可能感興趣的試卷

你可能感興趣的試題

2.單項(xiàng)選擇題In its simplest form the pressure reducing valve is opened or closed by () which is balanced by the downstream pressure acting on a diaphragm.

A.adjusting a nut
B.a pre-tensioned spring
C.any spring
D.upstream pressure

3.單項(xiàng)選擇題Most marine biological sewage treatment plants consist of all the following statements except ().

A.aeration tanks
B.settling tanks
C.disinfection agent
D.anaerobic bacteria

5.單項(xiàng)選擇題A check valve is another name for ().

A.a test valve
B.an inspection valve
C.a stop valve
D.a non-return valve