确诊为重度子痫前期时首选药物是（）
A.硫酸镁
B.哌替啶肌注
C.肼屈嗪静脉滴注
D.甘露醇快速静脉滴注
E.冬眠1号肌注
参考答案：A
My father _____ away for two months．I want to do something special for him when he comes back next week．
A．will be
B．has been
C．was
D．had been
标准不确定度有哪几种评定方法？
