单项选择题

Camphor oil is classified as a（）.

A.Grade A flammable liquid
B.Grade C flammable liquid
C.Grade D combustible liquid
D.Grade E combustible liquid

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By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.

A.six months
B.one year
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D.thirty months

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By law，a user of marijuana shall be subject to（）.

A.loss of pay during the period of such use
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A.lower most continuous deck not broken by water tight bulkheads
B.after most weather deck above the main strength deck
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D.deck of light construction below the main or strength deck