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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？（）
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
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以下网络中，属于广域网的有哪些？（ ） Ⅰ．以太总线网(Ethernet) Ⅱ．光纤分布式数字接口FDDI Ⅲ．令牌环网(Token Ring) Ⅳ．异步传输模式ATM Ⅴ．B-ISDN Ⅵ．公用分组交换网(X.25)A．Ⅰ、Ⅱ和ⅢB．Ⅱ、Ⅳ和ⅤC．Ⅱ、Ⅴ和ⅥD．Ⅳ、Ⅴ和Ⅵ
考题
下列关于PDCA循环理论描述中正确的是A、Play、Do、Check、AbbreviateB、Play、Develop、Check、ActionC、Play、Develop、Capacity、AbbreviateD、Plan、Do、Check、ActionE、Plan、Do、Check、Abbreviate
考题
下面哪些短语表达正确:()
A、check out (酒店)办理退房手续B、check in 办理登机手续C、check into a hotel 入住酒店房间D、check in (酒店)办理入住登记
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
下面哪些是正确的常用的局域网介质访问控制方法? ( )Ⅰ．CSMA/CDⅡ．Token RingⅢ．Token BusⅣ．NetWareA．Ⅰ、ⅡB．Ⅰ、Ⅱ、ⅢC．Ⅲ、ⅣD．Ⅰ、Ⅲ、Ⅳ
考题
在Token Bus与Token Ring的讨论中，以下哪些是环维护工作需要完成的任务? 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、Ⅲ、ⅤC．Ⅰ、Ⅱ、ⅣD．Ⅱ、Ⅴ
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
以下关于环网技术说法正确的是（）。A、以太网环技术日趋成熟且成本低廉，解决二层网络环路问题的技术有RPR和RRPPB、RRPP（Rapid Ring Protection Protocol，快速环网保护协议）是一个专门应用于以太网环的网络层协议C、RRPR需要专用硬件，因此成本较高D、RRPP的收敛时间与环网上节点数无关，可应用于网络直径较大的网络
考题
单选题White smoke exhausting from a diesel engine can be caused by （）A
low combustion temperatureB
a leaking fuel nozzle check valveC
late fuel injectionD
plugged oil-scraper ring hole
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PDCA是以下哪些英语单词的缩写（）。A
plan，do，check，actionB
plan，design，check，actionC
play，do，check，actionD
plan，design，check，asking
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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