单选题Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）Aprolong the ignition delay periodBensure the beginning of fuel injectionCthoroughly utilize the air chargeDallow controlled fuel combustion
单选题
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）
A
prolong the ignition delay period
B
ensure the beginning of fuel injection
C
thoroughly utilize the air charge
D
allow controlled fuel combustion
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