When start a screw pump, the by pass v

1、A screw pump belongs to （） according t

A screw pump belongs to （） according to its working principle.Areciprocating pumpsBpositive displacement pumpsCcentrifugal pumpsDcentripetal pum

2、By the stowage factor, when given a ce

By the stowage factor, when given a certain volume of space, we know（）.Athe space of the shipBthe space of one holdCwhat kind of cargo can be stowedDhow much cargo can be stowed

3、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

4、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

5、When starting a reciprocating pump, th

When starting a reciprocating pump, the inlet valve should be （）.AclosedBopened fullyCcracked openDpartly ope

6、The information passed on by word of m

The information passed on by word of mouth is important because____.A ***** through any other sourceB it helps ***** of the best housing never...