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
单项选择题 By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.
单项选择题 By law，a user of marijuana shall be subject to（）.
单项选择题 By definition，a "spar deck" is the（）.
