X线诊断矽肺的肯定依据是() ["A．团块阴影","B．结节阴影","C．网状阴影","D．边缘性肺气肿","E．肺门淋巴结蛋壳样钙化"]
病毒性肺炎以_______病原占首位；细菌性肺炎以_______病原占首位。
婴幼儿时期由于________和________易患呼吸道感染。
腭扁桃体至_______岁末逐渐增大，于________达发育高峰________则渐退化。
属于低水平消毒剂的是() ["A．戊二醛","B．过氧乙酸","C．碘伏","D．氯己定","E．异丙醇 "]
婴幼儿咽鼓管较_______、_______、________、________，故鼻咽炎时易侵及________
