单选题Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）Acylinder head cracksBpiping jointsCpump leakingDall of the above
单选题
Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）
A
cylinder head cracks
B
piping joints
C
pump leaking
D
all of the above
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