With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosion<br>A:(1) only<br>B:(2) only<br>C:both (1) and (2)<br>D:neither (1) or (2)

With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosion
A:(1) only
B:(2) only
C:both (1) and (2)
D:neither (1) or (2)

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