单项选择题

To determine if the lube oil filter elements need changing, _____.
A.open the filter and inspect the elements
B.check the lube oil pump discharge pressure
C.check the lube oil header pressure
D.check the pressure drop across the filter

A.
A.open
B.check
C.check
D.check

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麻醉过程中低温对机体的影响，下列错误的是（）
A.麻醉药物的作用延长
B.全身氧耗减少
C.容易出现代谢性酸中毒
D.血液的黏性增加
E.易发生血管内凝血

A.麻醉药物的作用延长
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C.容易出现代谢性酸中毒
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Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring___________.
A.back
B.side
C.gap
D.bottom

A.
A.back
B.side
C.gap
D.bottom