二冲程柴油机的曲柄销靠近这轴颈的一侧磨损大的原因是_______
A. 气体力的作用
B. 惯性力的作用
C. 摩擦力的作用
D. A+B
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You are attempting to parallel two AC generators and the synchroscope pointer is revolving
A. higher than the bus frequency
B. lower than the bus frequency
C. file same as file bus frequency but out of phase with it
D. the same as the bus frequency, and the circuit breaker may be closed at nay pointer position
如果美联储卖出政府有价证券，其他利率会________，同时汇率会________。
A. 上升；上升
B. 不变；上升
C. 下降；下降
D. 上升；不变
E. 上升；下降
活塞顶面因积炭严重而过热，将导致_______
A. 烧蚀
B. 裂纹
C. 局部过热
D. 腐蚀
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