单项选择题
To determine that a compartment contains sufficient oxygen to sustain life, you should use a/an （）.
A.explosimeter B.oxygen indicator C.fresh air indicator D.all of the above
单项选择题 An oxygen indicator will detect （）.
单项选择题 The term "oily mixture", as defined in the Pollution Prevention Regulations includes （）.
单项选择题 The term "oil", as used in the Pollution Prevention Regulations, means （）.
