A spur gear pump should be operated wi

1、The injector pump is operated by a cam

The injector pump is operated by a cam which drives （） up and down.Athe needle valveBthe plungerCthe pistonDthe cylinder

2、The starting air bottle should be pump

The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.Aair compressorBrefrigeration compressorCvacuum pumpDpurifier

3、Chafing gear should be placed（）.

Chafing gear should be placed（）.Aat all wearing points of mooring linesBat the bitter ends of all standing riggingCaround running riggingDon wire rope only

4、Which operation should be done when la

Which operation should be done when launching an inflatable liferaft by hand?（）AOpen the liferaft casingBTurn the valve on the CO2 cylinder to...

5、To operate a centrifugal fire pump at

To operate a centrifugal fire pump at reduced capacity, you should （）.Areadjust the relief valveBthrottle the suction lineCthrottle the discharge valveDopen the priming line

6、Operating a rotary pump at speeds in e

Operating a rotary pump at speeds in excess of design requirements could cause（）.Adecreased clearances between rotating partsBdecreased slippage to the suction side of the pumpCair binding in the discharge portsDerosion and excessive wear