A:弹簧测力计对物体的拉力与物体所受的重力
B:弹簧测力计对物体的拉力与桌面对物体的摩擦力
C:物体对桌面的压力与桌面对物体的支持力
D:物体对桌面的压力与物体所受的重力
一根条形磁铁自右向左穿过一个闭合线圈,则流过灵敏电流计的感应电流方向是( )
A: Excuse me. Is there a ____ near here?
B: Yes, there is.
A: Where is it?
B: It's ____the science museum.
A: Is it____
B: No, it isn't. Go straight to the first crossing and then turn ____
A: OK. I'll ____there. Thanks.