矩形的面积为S,则长a和宽b之间的关系为S=( ),当长一定时,( )是常量,( )是变量。
ab;a;S,b
She has a pen in one of her hands, but what's that in her______hand?[ ]
A. one
B. another
C. the other
D. other
头部按摩按照经络运行的线路,应先做中间督脉经的神庭、()、向会、百会等穴位。
A.曲差
B.上星
C.眉冲
D.承光