Beijing is cold this time of year. You need _______ warm clothes if you go there.
A:pack
B:packing
C:packs
D:to pack
为测量待测电阻Rx阻值,小敬设计了如图所示的电路,R0的阻值已知且电源电压不变,她____(填“能”或“不能”)测出Rx的阻值,因为____.
点P(3,-4)关于y轴对称的点的坐标是( )
____ ____ ____ ____ aunt?