题目内容

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

A. all of the oil used by the engine through a filter
B. some of the oil used by the engine through a filter
C. some of the oil used by the engine through a centrifuge
D. all of the oil used by the engine through a centrifuge

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假设美联储非常担心经济可能会进入衰退，美联储可能会采取什么政策？这种政策对实际GDP和价格水平又会有什么影响？

一个同家的实际GDP以每年5％的速度增长了三个季度，然后减速到以每年0．5％的速度增长了三个季度，然后又回到5％的速度。这个国家是否经历了经济衰退？请解释。

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A. Radiation
B. Conduction
C. Natural convection
D. contact directly

活塞销的主要损坏形式是_______ I. 磨损，II. 摩擦，III. 擦伤，IV. 腐蚀，V. 裂纹

A. I+II+V
B. I+V
C. II+V
D. I+III+V