单项选择题

An example of a grade C product is（）.

A.naphtha，vm and p
B.tridecanol
C.cottonseed oil
D.camphor oil

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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
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