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【单选题】
咽鼓管描述,错误的是A.
咽鼓管连通鼻咽部与鼓室，长 3.5 ～ 4.0cm
B.
咽鼓管使鼓室的气压与外界的大气压相等，以保持鼓膜内、外的压力平衡
C.
小儿咽鼓管短而宽，接近水平位，故咽部感染可经咽鼓管侵入鼓室
D.
咽鼓管咽口平时处于开放状态，在吞咽和尽力张口闭合;
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