A:b点的电场强度一定比a点大
B:电场线方向一定从b指向a
C:b点的电势一定比a点高
D:该电荷的动能一定减小
有些动物具有社会行为,社会行为的特点表现在( )
3.8×2=____10×0.7=____13.9×0=____5.5×1=____2.5×4=____ 2.5×8=____0.5×0.2=____3.2×3=____
﹣ It is reported that cancer can be controlled at a temperature lower than 100℃below zero.
﹣ Really? ______ nice surprise!