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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？（）
- A、DMAC为ONT系统MAC
- B、SMAC为桥MAC
- C、DMAC为广播MAC值为0xFF
- D、SMAC为ONT系统MAC
参考答案
更多 “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？（）A、DMAC为ONT系统MACB、SMAC为桥MACC、DMAC为广播MAC值为0xFFD、SMAC为ONT系统MAC” 相关考题
考题
In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring grooveA.①B.②C.①②D.neither ① nor ②
考题
In a diesel engine, when refitting piston rings you should______. I. check the ring gap at the smallest diameter of the cylinder II. remove carbon from the ring grooveA.I onlyB.II onlyC.both I and IID.neither I nor II
考题
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”.
考题
一般局域网采用（）和环型令牌网Token Ring为主。A、广域网WAN（Wide Area Network）B、城域网MAN（Metropolitan Area Network）C、共享介质局域网（Shared LAN）D、总线以太网Ethernet
考题
单选题In large, low-speed, main propulsion diesel engine, position ring groove wear usually occurs at the（）A
top of the ring grooveB
back of the ring grooveC
bottom of the ring grooveD
piston ring end clearance
考题
单选题备锚，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”.
考题
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
考题
单选题In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring grooveA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
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
考题
单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）A
backB
sideC
gapD
bottom
考题
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
考题
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
考题
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
考题
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
Three ring life buoysD
Two ring life buoys on each side of the ship
考题
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
考题
单选题In a diesel engine, when installing new piston rings it is important to check（） Ⅰ.ring gap clearance Ⅱ.side clearanceA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰnor Ⅱ
考题
单选题When installing rings on a diesel engine piston, you should check the ring（）A
diametrical tensionB
gap clearanceC
radial thicknessD
face thickness
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