A charge of fresh air is drawn into the engine cylinder and then （） by the moving piston（） very high pressure.

[单选题]In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.A . pressure chargedB . naturally aspiratedC . contaminatedD . high speed diesel

[单选题]The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.A . the cylinder headB . the cross-headC . the moving pistonD . the stationary pisto

[问答题]Open the window and let the fresh air in.

[问答题]Open the window and let the fresh air in.

In fact fresh air is very ( ) to our health.Infactfreshairisvery()toourhealth.A.

trees have been planted near here，so the air is very fresh．（ ）A. Two hundredsB.

[单选题]The officer in charge of the engineering watch shall notify the chief engineer without delay ____.A．in any emergency or if in any doubt as to what decision or measures to takeB．in the event of any impending action in machinery spaces that may cause r

[单选题]The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the __ of operation when notified that the ship is in congested waters.A．manual modeB．automatic mode

[单选题]Compressed air is supplied by air compression to （）.A . the air receiversB . the starting valvesC . the cylinder coversD . the distributor

[单选题]Will we connect the motor with the fresh water pump? No, the pump is ( )_A．in good orderB．out of orderC．works well