Spontaneous ignition can result from().
A. an unprotected drop-light bulb
B. careless disposal or storage of material
C. smoking in bed
D. worn electrical wires on power tool
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Follot四联征在超声心动图上有哪些特征性表现?
当有旅客滞留在飞机上,飞机在除冰时,应该()
A. 广播通告旅客:系好安全带坐在座位上
B. 关闭盥洗室
C. 所有舱门关闭且滑梯预位
D. 明确担架旅客的撤离出口