四冲程柴油机的曲柄销靠近主轴颈的一侧磨损_______
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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
When the ship is going to enter into the harbor, ____.
A. change from heavy fuel oil to diesel oil for main engine
B. pumping out bilge water
C. change sea chest from high level one to lower level one
D. test emergency generator
In reducing engine speed to an efficient propeller speed by the use of reduction gears, _______.
A. speed and torque are both reduced
B. speed is reduced and torque remains unchanged
C. speed is reduced and torque is increased
D. speed is sometimes unchanged while torque is increased
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