A.in order that
B.because of
C.in order to
D.owing to
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A.should be correctly carried out
B.should correctly be taken place
C.should carried with care
D.must to carry out with great care
A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets
A.too low starting air pressure
B.main starting valve closed
C.neither A nor B
D.A and B
A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air temperature
A.the stem and heads are made of different material
B.low-alloy steel is used throughout
C.a replaceable valve disk is welded to the head
D.the self-centering action comes from motion of the valve stem in the guide
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.