A:busy visiting
B:worth visiting
C:ready to visit
D:able to visit
如图所示,长度为l的绝缘细线将质量为m,电量为q的带正电小球悬挂于O点,整个空间中充满了匀强电场.电场方向水平向右,且电场强度E= 4mg3q .现使小球在最低点A获得一水平向右的速度v0.若小球能够在竖直面内做完整的圆周运动,求v0应该满足的条件.
读图,比较甲坡降水与乙坡降水的多少( )
白色盘状南瓜与黄色球状南瓜杂交,F1全是白色球状南瓜,F2中白色盘状南瓜杂合体有3360株,则F2中纯合的黄色球状南瓜大约有
⑴Can we have a lo ok at those socks?____ A. Here it is.
⑵May I try them on?____ B. Sure, here you are.
⑶Where are my shoes?____ C. Here they are.
⑷Where is it?____ D. Certainly.