若组成为Zi的物系,∑Kixi>1,且∑KiZi>1时,其相态为()
参考答案:气液两相
芦根与淡竹叶具有的共同功效是()
A.止呕
B.利尿
C.止咳
D.凉血
E.发汗
_____entering the classroom, remember to take your seat and turn off your cell phone.
A.At
B.From
C.Upon
D.As