139邮箱只能给彩信客户发彩信，不能给一般的手机客户发送。
参考答案：对
介绍一下你家的成员！
Hello, I'm _____________.
Come and look at my family.
This is my _____________.
He / She likes _____________.
This is my_____________.
There are ______________ members in my family.
机械通气导致通气不足的原因有（）
A.潮气量设定不足
B.管道漏气
C.吸呼比不合适
D.机械死腔过大
E.呼吸道梗阻
