单项选择题
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
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A.Good communication
B.A dedicated crew
C.Good equipment
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The indication of a slipping anchor is a（n）（）.
A.Decrease in mooring line length
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The Coordinator Surface Search（CSS）in a SAR situation should display by night（）.
A.Deck lights forward and aft
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