光缆损耗主要是由光纤本身、接头和()造成的。 ["设备","人为造成","外界环境","熔接点"]
手术后乳胶片引流拔除时间一般在术后() ["5天以后","3天","4天","5天","1~2天"]
决定煤气所处状态的物理量有()。 ["温度","压力","重度","时间"]
施工对光纤的哪种特性将产生直接的影响。() ["光学特性","几何特性","传输特性"]
预防术后肺不张最主要的措施是() ["应用大量抗生素","蒸汽吸入","多翻身多做深呼吸,鼓励咳嗽","应用祛痰药物","氧气吸入"]
个体身心发展