99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

<ruby id="yjrbd"><output id="yjrbd"></output></ruby>

單項選擇題

A relief valve for a cargo pump is generally installed（）.

A.after the discharge valve
B.between the pump and discharge valve
C.after the suction valve
D.between the pump and suction valve

你可能感興趣的試題

單項選擇題

A gas-free certificate would usually be issued by a(n)（）.

A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.MSA marine inspector

單項選擇題

A fire of escaping liquefied flammable gas is best extinguished by（）.

A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction