单项选择题

The MOST important element in administering CPR is（）.

A.having the proper equipment for the process
B.starting the treatment quickly
C.administering of oxygen
D.treating for traumatic shock

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The most effective first aid treatment for chemical burns is to immediately（）.

A.apply ointment to the burned area
B.flood the affected area with water
C.wrap the burn with sterile dressing
D.apply an ice pack to the burned area

单项选择题

The minimum concentration of a vapor in air which can form an explosive mixture is called the（）.

A.auto-ignition point
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C.lower explosive limit (LEL)
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The minimum amount of lifesaving equipment required aboard an 85-foot uninspected towing vessel consists of（）.

A.one approved flotation cushion for each person on board
B.one approved life preserver for each person on board and one life ring
C.one approved inflatable vest for each person on board
D.lifeboat capacity equal to 1 1/2 times the number of persons on board