单项选择题

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单项选择题
Do not interrupt CPR for more than ______ at a time.
A．5 seconds
B．10 seconds
C．15 seconds
D．20 seconds
单项选择题
The order of the CPR should be______. A (airway clearance) B (month-to-mouth breathing) C (chest compression)
A．ABC
B．ACB
C．BAC
D．CAB
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