【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)
【简答题】Fill in the blanks by selecting suitable wordsfrom the word bank. You may not use any of the words more than once. A reduction B weld C involved D levy E approaches F enhance ...
【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...
Context denotes some physical environment or setting in which we produce or comprehend utterances.
B.
Context refers to some invisible social or mental factors, esp. Social distance, power relations, encyclopedic knowledge and expectations, that affect the production or comprehension of certain utterances.
C.
Context refers to the preceding utterances and/or the following ones.