自从第二次世界大战以来，经济扩张和经济衰退的平均长度发生了什么变化？
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which machineries and spare parts should the third engineer be in charge of
四冲程柴油机的曲柄销靠近主轴颈的一侧磨损_______
A. 大
B. 小
C. 一样
D. A或B
当潜在GDP上升，________。
AS曲线向右移动
B. 沿着AS曲线向上移动
C. AS曲线向左移动
D. 沿着AS曲线向下移动
E. 既没有AS曲线的移动也没有沿着AS曲线的移动
Which of the following statements represents an advantage of an electromagnetic clutch？
A. Large misalignments can be tolerated between the shaft and engine coupling
B. Slip is held to a minimum when reversing shaft rotation
C. Engine torsional vibrations to the driven shaft are eliminated
D. It aids in maintaining power factor
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