对气道阻力影响不大的因素是（）。
A.气体流速
B.气道口径大小
C.气道物理形状
D.气道内分泌物聚积
E.身高
参考答案：E
This cake is very sweet. You a lot of sugar in it.
A．should put
B．could have put
C．might put
D．must have put
船用电缆、电线的绝缘材料（）阻燃性；防护材料（）阻燃性。
A．具有/具有
B．具有/不具有
C．不具有/具有
D．不具有/不具有
