— Tim, how do your parents like pop music?
— _____ my dad ______ my mom likes it. They both prefer classical music.
A:Either; or
B:Neither; nor
C:Not only; but also
下列图中,a、b、c是匀强电场中的三个点,各点电势φa=10V,φb=2V,φc=6V,a、b、c三点在同一平面上,图中电场强度的方向表示正确的是( )
下列调查中,适宜采用普查方式的是( )