选派人员计入备案人数，派出时间必须是（）。
A.90天以上
B.365天
C.30天
D.180天
参考答案：A, B, D
he steps on the stage,he will sing the song which made him famous two years ago.
A．Many times
B．In no time
C．Every time
D．All the time
高渗性缺水是指血清钠大于( )mmol/L的缺水
A．155
B．135
C．140
D．150
E．145
