A:which
B:who
C:what
D:where
求函数y=cos2x+2sinx﹣2值域.
x=____(填小数)
—It lies _______ the south of China. It is _______the coast.
在温暖的环境中,久放的萝卜会空心,重量明显减轻,其主要的原因是( )