单选题In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）Acompression strokeBsuction strokeCexpansion strokeDexhaust stroke
单选题
In the two stroke diesel engine, it is designed so that the oil impingement is timed to proceed only on the piston ring belt during（）
A
compression stroke
B
suction stroke
C
expansion stroke
D
exhaust stroke
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