单项选择题
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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相关考题
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单项选择题
A petroleum liquid has a flash point of 135°Fahrenheit. This liquid is classed as a grade （）.
A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid -
单项选择题
A flame screen（）.
A.permits the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank -
单项选择题
（）shall be provided in every cargo tank and slop tank in accordance with the appropriate Resolutions.
A.A load on top system
B.Direct line system
C.Circle line system
D.An inert gas system
