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【简答题】Because of the rising cost of fuel, scientists are building automobile engines who will conserve gasoline but still run smoothly.
【单选题】To reduce the weight of the reciprocating parts, pistons of high-speed engines are made considerably shorterThis results in __________.
A.
less piston slap and quieter running
B.
increased crankshaft bearing wear
C.
slightly greater piston wear
D.
decreased side pressures
【简答题】Due to this limit, what happen to the early German gas turbine engines?
【单选题】The early engines could ____________ (产生)one or two horsepower.
A.
burn
B.
produce
C.
system
【单选题】The early engines could____________(产生) one or two horsepower.
A.
product
B.
produce
C.
productive
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