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问题:

[单选] Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().

A . reduce engine horsepower output
B . aid in silencing the exhaust noise
C . increase the mean effective pressure
D . contribute to effective cylinder scavenging

简述链壶菌、离壶菌的防治方法。 4对等位基因的杂合体亲本AaBbCcDd与aabbccdd的亲本进行杂交,得到1000个子代,分类如下: 不连锁的基因是() A和D。 B和D。 A和C。 B和C。 全部连锁。 功和热是与()联系在一起的,都不属于系统的性质。 状态。 过程。 始态。 终态。 伴随系统本身温度变化而与环境传递的热量,称为()。 显热。 相变热。 溶解热。 反应热。 MV ATLANTIC 0200UTC POSN 33.55N 127.22E COURSE 088 DEGS SPEED 12.5 KTS SAILOR FELL FROM MAST SERIOULY WOUNDED AT HEAD. This cable says that(). the wounded had nothing wrong with his head。 the injury was not serous。 the injury happened at the mast head。 a sailor injured at his head。 Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().
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