NO FLOW STAGE SUCTION PRESSURE PSLL-741表示（）。

[单选题]If the suction pressure at the refrigeration compressor is below normal, the cause can beA．refrigerant overchargeB．overfeeding by the expansion valveC．a restricted suction strainerD．due to short cycling of the compress

[单选题]During the suction stroke, the piston is moving （）.A . inwardsB . outwardsC . downwardsD . upward

[单选题]The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.A . suctionB . compressionC . expansionD . exhaust

[单选题]In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.A . by an fuel valveB . through an inlet valveC . with an exhaust valveD . from an outlet valve

[单选题]Four strokes consist of suction, compression, （） and exhaust stroke.A . combustionB . condensationC . chargingD . evaporatio

[单选题]Which of the following is not the stage of programming? (74)(74) A． write a programB． print the messageC．compile the programD．debug the program

[单选题]Lube oil pumps taking suction from the sump of most small marine engines are usually （）.A . of the diaphragm typeB . of the centrifugal typeC . of the positive displacement typeD . independently driven by electric motor

[单选题]The task of the general design stage in structured life circle method is, to build what kind of software system structure?A．program structureB．general structureC．module structureD．function structure

[名词解释] 感染阶段infective stage

[名词解释] 感染期(infective stage)