单项选择题
An example of a grade B product is（）.
A.piperyline
B.motor gasoline
C.kerosene
D.mineral spirits
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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
