单项选择题
The self-contained breathing device should not be used in which situation（）.
A.Oxygen deficient spaces
B.Compartments containing poisonous vapors
C.Fighting fires that produce heavy smoke
D.Underwater search
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The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.
A.Cupping a hand around the patient's mouth
B.Keeping the head elevated
C.Applying his mouth tightly over the victim's mouth
D.Holding the jaw down firmly -
单项选择题
The key to rescuing a man overboard is（）.
A.Good communication
B.A dedicated crew
C.Good equipment
D.Well-conducted drills -
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The indication of a slipping anchor is a（n）（）.
A.Decrease in mooring line length
B.Increase in the opposite amperage
C.Increase in the opposite line tension
D.Decrease in mooring line tension and amperage
