低钾型周期性麻痹是哪个离子通道病（）
A.钠离子通道
B.钙离子通道
C.钠和钙离子通道
D.钾和钙离子通道
参考答案：B
以上属于相畏的配伍是
A．官桂与赤石脂B．人参与莱菔子C．半夏与生姜D．黄连与木香
The desks and seats can be used for a long period of time, they _____ the height of the children. [ ]
A. must be adjusted to
B. can be adjusted to
C. must adjust to
D. can adjust to
