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名词解释题
contractile ring（收缩环）
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在Token Bus与Token Ring的讨论中，环维护工作需要完成的任务有( )。 Ⅰ．环初始化 Ⅱ．用户使用权限 Ⅲ．新结点加入与撤出环 Ⅳ．优先级 Ⅴ．操作系统版本更新A．Ⅰ、Ⅱ、ⅢB．Ⅰ、Ⅱ、ⅤC．Ⅰ、Ⅲ、ⅣD．Ⅱ、Ⅴ
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备锚，摇“备车”钟。（）A、Get anchor ready and ring “Stand by engine”.B、Get anchor ready and ring “Finished with engine”.C、Get mooring ready and ring “Stand by engine”.D、Get mooring ready and ring “Finished with engine”.
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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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back of the ring grooveC
bottom of the ring grooveD
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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
is coming upward；cylinder ring beltB
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
back of the ring groove
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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
ⅠonlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
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单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）A
backB
sideC
gapD
bottom
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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
backD
radial
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多选题Ring check主要用于检测和消除用户侧的环网，Ring check报文格式描述正确的是哪些？（）ADMAC为ONT系统MACBSMAC为桥MACCDMAC为广播MAC值为0xFFDSMAC为ONT系统MAC
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单选题On a ship，how many ring buoys are required to have a buoyant line attached?（）A
One ring life buoyB
One ring life buoy on each side of the shipC
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单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）A
excessive ring actionB
excessive ring temperatureC
improper ring rotationD
excessive ring face wear
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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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