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[单选题]At least () cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.
A. 6
B. 2
C. 12
D. 8
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[单选题]If the engine does start on air, but combustion does not immediately begin, the cause may not be ().
A. low compression
B. failure of the fuel pump to discharge fuel
C. incorrect timing of fuel pump
D. turning gear being still o
[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives ().
A. the oil separator
B. the fresh water generator
C. the compressor
D. fire pum
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