【单选题】*Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speed.1n most reduction gears, the bull gear ____.
A.
must churn(搅拌)the oil in the sump
B.
is connected to the propeller shaft
C.
is driven at the highest r/min
D.
compensates(补偿) for alignment variations between the engine and pinion gear(小齿轮)
【判断题】U Model: If the slope is S%, any doubling of the production quantity from some unit #n to another unit #2n results in a reduction in labor hours from Hn to S% of Hn.在U 模型中,完成工作所需时间(成本)下降的百分比以S %表示,通过长...