单选题With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosionA(1) onlyB(2) onlyCboth (1) and (2)Dneither (1) or (2)
单选题
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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