A:When was it
B:It was when that
C:It was whe
D:When it was that
给词语找意思相反的朋友。
细____ 远____
进____ 笑____
(Ⅰ)若直线l和曲线C有公共点,求倾斜角α的取值范围;
(Ⅱ)设B(x,y)为曲线C任意一点,求 3x+y 的取值范围.
如图是某二倍体生物减数第一次分裂形成的子细胞,正确的是( )