I hope this ( ) further business between
题型：单项选择题
问题：
I hope this ( ) further business between us.
A．leads to
B．will lead to
C．leading to
D．lead to
题型：单项选择题
I hope this ( ) further business between us.
A．leads to
B．will lead to
C．leading to
D．lead to
,
，F点为CD的中点。保持该电场的大小和方向不变，让正方形以B点为轴在纸面内顺时针转过
，则此时的F点电势和该匀强电场的场强分别为 
、
、
、
、