属于浅反射的是()
A.趾反射
B.提睾反射
C.肛门反射
D.角膜反射
E.腹壁反射
参考答案:A, B, C, D, E
_____ the weather, the swimming match has been put off. [ ]
A. Because
B. Thanks to
C. Thanks for
D. With the help of
如图所示,细线拴一带负电的小球,球处在竖直向下的匀强电场中,使小球在竖直平面内做圆周运动,则( )
A.小球可能做匀速圆周运动
B.当小球运动到最高点时绳的张力一定最小
C.小球运动到最低点时,球的线速度一定最大
D.小球运动到最低点时,电势能一定最大