体位引流
参考答案：
指利用重力促进各个肺段内积聚的分泌物排出，不同的病变部位采用不同的引流体位，其目的是使此病变部位的肺段向主支气管垂直引流。
People can make silly mistakes about a person if they judge him ____ the clothes he wears. [ ]
A. by
B. with
C. accordingly to
D. through
说明接入网中二线双工的方法。
