3、dtheTibetanPlateau,agriculturalandpastoralareasand,inconjunctionwiththeMinistryofcultureandIslamicculture5.如图4所示,是条形磁体的磁场分布图,下列说法正确的是 A.该条形磁体的左端为N极,右端为S极 B.a处的磁场强弱与b处的磁场强弱相同 C.置于a点的小磁针,静止时南极指向左侧 D.磁感应线是为了研究方便引入的假想曲线 6.如图5所示,电源电压恒定不变,闭合开关S,滑片P向右移动,下列说法正确的是 A. 示数变小, 示数变小 B. 示数不变, 示数变小 C. 示数不变, 示
4、数不变 D. 示数变小, 示数不变 7.如图6所示,凸透镜的应用事例中,所成像性质完全相同的有 istheTibetanPlateaupoly.Centercityonlyapopulationofoveronemillion.Xiningislocatedinthe"Tangfangudao"andtheancient"SilkRoad"road,istheLoessPlateauandtheTibetanPlateau,agriculturalandpastoralareasand,inconjunctionwiththeMinistryofcultureandIslamicculture