In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

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

[单选题]An indication of a diesel engine air intake being partially clogged, is （）.A . low firing pressure and low exhaust temperaturesB . low firing pressure and normal exhaust temperaturesC . high firing pressure and low exhaust temperaturesD . high firing

[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

[名词解释] 诱变育种（induced mutation breeding）

[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

[填空题] 英译中（Translate）：induced enzyme（）

[名词解释] stress-induced premature senescence ,SIPS(胁迫诱导的早熟性衰老)

[名词解释] 人流活产比(ratio of induced abortion and live birth)

[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