單項(xiàng)選擇題當(dāng)傷者牙關(guān)緊閉,無(wú)法進(jìn)行口對(duì)口人工呼吸時(shí),應(yīng)()

A.用工具把嘴撬開
B.加大壓力口對(duì)口吹氣
C.口對(duì)鼻吹氣


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