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名词解释题
contractile ring（收缩环）
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单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）A
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单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）A
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is going downward；piston ring beltC
is coming upward；piston ring beltD
is going downward；cylinder ring belt
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单选题A diesel engine piston ring face is in direct contact with the （）.A
top of the ring grooveB
cylinder liner oil filmC
bottom of the ring grooveD
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单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.sideA
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Ⅱ onlyC
both Ⅰ and ⅡD
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单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）A
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sideC
gapD
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单选题In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.A
piston crownB
piston ring grooveC
piston skirtD
piston ring area
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单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）A
gapB
sideC
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单选题On a ship，how many ring buoys are required to have a buoyant line attached?（）A
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excessive ring temperatureC
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判断题用保护环（Guarding Ring）可以在一定程度上防止Latch up效应的出现，比如说，在P沟道的MOS管上用P+的环。A
对B
错
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