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單項(xiàng)選擇題

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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An example of a grade B product is（）.
A.piperyline
B.motor gasoline
C.kerosene
D.mineral spirits
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An entry of water，gas，oil，or other formation fluid into the wellbore is called a（）.
A.blowout
B.kick
C.gusher
D.flow