Most fuel injection nozzles are opened by （）.<br>A:fuel oil pressure<br>B:a cam operated follower<br>C:a spring-loaded pressure plate<br>D:timing gears keyed to the crankshaft

Most fuel injection nozzles are opened by （）.
A:fuel oil pressure
B:a cam operated follower
C:a spring-loaded pressure plate
D:timing gears keyed to the crankshaft

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