单选题A safe fuel system must（）.Aprevent engine overheatingBhave proper air/gasoline fuel mixture ratioCbe liquid- and vapor-tightDsupply sufficient air to the intake manifold
单选题
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
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