During the suction stroke, the piston is moving （）.

[单选题](piston area)×(piston stroke)×(numbers of the cylinders)=engine( ).A．brake horsepowerB．displacementC．cylinder volumeD．cylinder clearance

[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]During working, when the piston is near the （）, the air ignites the fine spray of fuel.A . TDCB . DTCC . BDCD . BCD

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

[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

[名词解释] complete stroke

[单选题]英语PISTON指（）A .活塞B .开关C .按钮D .弹簧

[单选题]The lowest ring of a piston is （）.A . a coil springB . a sealing ringC . an oil distributor ringD . main seal ring