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单选题
Waldeyer tonsillar ring是指（）
A
内环
B
外环
C
咽淋巴环
D
鼓环
E
气管软骨环
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更多 “单选题Waldeyer tonsillar ring是指（）A 内环B 外环C 咽淋巴环D 鼓环E 气管软骨环” 相关考题
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
Third Mate, we’ll enter the harbour, you should ring “（）”now.A、Stand byB、Ring off engineC、Finished with engineD、Finish it
考题
What are two characteristics of dual-ring interconnect in SDH networks？ （）A、 It protects signals against node failures between rings.B、 It protects signals against node failure within a single ring.C、 It allows for traffic to be preempted when a ring switch occurs.D、 Traffic can be dropped and continued at interconnecting nodes.E、 It protects preemptible traffic from being dropped when a ring switch occurs.
考题
单选题The lowest ring of a piston is （）.A
a coil springB
a sealing ringC
an oil distributor ringD
main seal ring
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
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How is SNCP and MS-SPRing traffic rerouted during a protection switch when a complete fiber cable cut occurs？（）A
SNCP traffic is switched from the first node that recieves the AIS. MS-SPRing traffic is rerouted from the first in the ring.B
SNCP traffic is selected at the destination node in the ring. MS-SPRing is rerouted from the originating node in the ring.C
SNCP traffic is rerouted from the originating node in the ring. MS-SPRing traffic is rerouted from the originating node in the ring.D
SNCP traffic is selected at the destination node in the ring. MS-SPRing traffic is rerouted from the last reachable node in the ring.
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---Ring off engine! ---Ring off engine! （）A
Finished with engine!B
Engine rung off!C
Engine stand by!D
Got it.
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If the gas pressure behind the ring is built up too slowly, and thereby exerts an inadequate outward pressureIn such a case, the combustion gas can penetrate between the liner and ring, and violently force the ring inwards, in the grooveWhat result will this type of sudden "shock" loading eventually lead to?（）A
micro-seizureB
scratchC
breakD
stick
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
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The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.A
upwards；inwardsB
upwards；outwardsC
downwards；inwardsD
downwards；outwards
考题
单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）A
faulty combustionB
excessive ring temperatureC
over lubricationD
all of the above
考题
单选题What is the purpose of Dual Ring Interconnect with D C for SDH rings？（）A
Protects signals when a ring switch failsB
Protects signals when multiple span switches failC
Protects pre-emptible traffic from being dropped when a ring switch occursD
Protects signals against any combination of link failure in each ring
考题
名词解释题Waldeyer淋巴环
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