A:①②
B:③④
C:②③
D:①④
如图,△ABC是锐角三角形,过点C作CD⊥AB,垂足为D,则点C到直线AB的距离是( )
求
(Ⅰ)函数f(x)的解析式;
(Ⅱ)函数y=Acos(ωx+ϕ)的单调递增区间.
—I don't want to go to school on foot. What should I do? —You try asking your father for a bike, or you can go by bus.
在静电场中,将一正电荷从a点移到b点,电场力做了负功,则( )