A.naphtha，vm and pB.tridecanolC.cottonseed oilD.camphor……

单项选择题An example of a grade B product is（）.

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

单项选择题An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.

A.blowout
B.kick
C.gusher
D.flow

单项选择题An engine compartment gasoline fire requires which type of extinguisher?（）

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

单项选择题An azimuth angle for a body is measured from the（）.

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

单项选择题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