單項選擇題The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.
A.because
B.though
C.since
D.until
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1.單項選擇題If cylinder liner wear is up to maximum limits the possibility of scavenge fires will not be materially reduced until the liners are （）.
A.polished
B.renewed
C.adjusted
D.ground
2.單項選擇題Fuel injection equipment must be kept in good condition, timed correctly, and the （）in each cylinder must also be carefully balanced so that individual cylinders are not overloaded.
A.MIP
B.MCR
C.MEP
D.BHP
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