A:电势等于零的物体一定不带电
B:电场强度为零的点,电势一定为零
C:同一电场线上的各点,电势一定相等
D:负电荷沿电场线方向移动时,电势能一定增加
台湾发展农业生产有利的自然条件是 ( )
He lost his key. It made him ________ in the cold to wait for his wife's return.