A safe fuel system must（）.<br>A:prevent engine overheating<br>B:have proper air/gasoline fuel mixture ratio<br>C:be liquid- and vapor-tight<br>D:supply sufficient air to the intake manifold

A safe fuel system must（）.
A:prevent engine overheating
B:have proper air/gasoline fuel mixture ratio
C:be liquid- and vapor-tight
D:supply sufficient air to the intake manifold

出自：海船船员证

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