The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.<br>A:principle<br>B:principal<br>C:cause<br>D:case

The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A:principle
B:principal
C:cause
D:case

出自：海船船员证

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