血清病A. 属Ⅰ型超敏反应性疾病B. 属Ⅱ型超敏反应性疾病C. 属Ⅲ型超敏反应性疾病

A.High pressure compressors are more efficient than low pressure compressors

B.Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unit

C.Two stage compressors are generally more efficient than single stage compressors

D.The volumetric efficiency is decreased in multistage compressors

A.rotary compressors

B.reciprocating compressors

C.centrifugal compressors

D.screw compressors

A.The load sharing protection mode can be classified into return mode and non-return mode.

B.Master/slave LAG protection mode can be classified into return mode and non-return mode.

C.The LAG aggregation mode of ZTE equipment can be classified into dynamic mode and static mode.

D.Currently, the 6300 equipment does not support master/slave LAG at NNI side.

The ____ stage air compressors are widely used on board the ship.

A.single

B.II

C.III

D.multiple

During compressors running the accumulated moisture in the separators must be _____.

A.drained off

B.collected

C.sent to the crankcases

D.separated with oil

Intercoolers installed on starting air compressors, reduce the possibility of__________.

A.dust entering the high pressure stage

B.lube oil carbonization

C.discharge pulsations

D.inter-stage vapor lock

Compressed air is supplied by air compressors to______.

A.the air receivers

B.the starting valves

C.the cylinder covers

D.the distributors

To obtain maximum efficiency, two stage air compressors are usually _____.

A.horizontally mounted

B.never fitted with intake filters

C.fitted with intercoolers

D.operated in an unloaded condition at all times