單項選擇題An example of a grade B product is().

A.piperyline
B.motor gasoline
C.kerosene
D.mineral spirits


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2.單項選擇題An engine compartment gasoline fire requires which type of extinguisher?()

A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above

3.單項選擇題An azimuth angle for a body is measured from the().

A.observer's meridian
B.Greenwich meridian
C.body's meridian
D.zenith distance

4.單項選擇題An authorized light to assist in the identification of submarines operating on the surface is a(n)().

A.blue rotating light
B.intermittent flashing amber/yellow light
C.flashing white light
D.flashing sidelight

5.單項選擇題An aneroid barometer on a boat should always be().

A.located in an air-conditioned area
B.mounted in the passenger compartment
C.protected by a collision bulkhead
D.permanently mounted