the inlet port is opened by the up coming piston； the port is closed by the down going
the inlet valve is opened by the down going piston；the inlet valve is closed
the inlet port is opened by the down going piston；the port is closed by the up coming
the inlet valve is opened
第1题：
The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.
A.fed from mechanical lubricators
B.thrown off from the main bearings
C.supplied from wick fed drip lubricators
D.flow from a centrifugal or banjo oiler
第2题：
Slow ahead（）engines!
第3题：
---Slow ahead both engines! ---Slow ahead both engines! ___________________!
A.Both engines slow ahead
B.Engine slow ahead port
C.Engine slow ahead starboard
D.Engine both ahead
第4题：
with
both
and
to
第5题：
a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
two medium-speed, turbocharged, four-stroke diesel engines
a variable-speed AC generator
第6题：
低速控制（）
第7题：
less even torque
higher cylinder head temperatures
fewer power strokes per revolution
greater weight/size requirements
第8题：
Slow ahead_______ engines!
A.with
B.both
C.and
D.to
第9题：
one half crankshaft speed in a two-stroke cycle diesel engine
crankshaft speed in a two-stroke cycle diesel engine
two times crankshaft speed in a two-stroke cycle diesel engine
one-fourth times crankshaft speed in a four-stroke cycle diesel engine
第10题：
scavenging
starting
cooling
blowing