____ ____ ____ that the earthquake led to many people ____ ____ alive.
空间某一静电场的电势φ在x轴上分布如图所示,x轴上两点B、C点电场强度在x方向上的分量分别是EBx、ECx,下列说法中正确的有( )
Mr. Green lives on the ____(three)floor.