单项选择题

An example of an anchor which has a stock is a（）.

A.Bruce anchor
B.Dunn anchor
C.Hook anchor
D.Danforth anchor

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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
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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