large conical springs
compressed air pressure
hydraulic pressure
exhaust gas pressure
第1题：
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.
A.large conical springs
B.compressed air pressure
C.hydraulic pressure
D.exhaust gas pressure
第2题：
Fuel is admitted to a diesel engine cylinder through the ______.
A.injector nozzles
B.carburetor
C.exhaust ports
D.intake valves
第3题：
(A) modern
(B) moderate
(C) moderation
(D) modest
第4题：
the inlet valve is open
the exhaust valve is open
both valves are close
both valves are open
第5题：
after TDC
before TDC
after BDC
before BDC
第6题：
why is quick closing valves important to in engine room machineries ?how are they operated ?
第7题：
When loading a tanker，you should ______．
A.load only one tank at a time
B.keep the seamen on watch on standby in the mess room
C.keep a strain on the loading hoses
D.close valves by closing them down，reopening one or two turns，and re-closing
第8题：
Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? l.Its discharge is continuous; ll.It has no internal valves: lll.Upon accidental closing of discharge valve, excessive pressure will not build up()
A.l, ll
B.ll, lll
C.l ,ll.III
D.llonly
第9题：
blows out the exhaust gases
supplies oxygen for combustion
cools the valves and cylinder walls
all of the above
第10题：
the inlet valve is open
the exhaust valve is open
both valves are closed
both valves are open