Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）<br>A:cylinder head cracks<br>B:piping joints<br>C:pump leaking<br>D:all of the above

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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