The car is in the box.

“神舟九号”与“天宫一号”对接后，若说“神舟九号”是静止的，则选择的参照物是（　　）

阅读短文，判断下面的句子是否与短文相符    Hello, friends! I am Bob. It's Monday today. I was very busy yesterday. In the morning, I got up early and had a math class. After math class, I went to the library and read books. I like to read books there. It's 12 0'clock, I went home by bus. I had lunch with my family. In the afternoon, I did my homework. When I finished it, it was too late. I was very tired and I went to bed late.

如图，有a、b、c三户家用电路接入电表，相邻电路的电线等距排列，则三户所用电线（   ）．

用电阻率为，横截面积为S的导线，绕成闭合的边长为a的正方形线圈n匝。将此线圈垂直于磁场方向放置，如图所示，由于磁场的均匀变化使线圈中的感应电流为I，方向如图中箭头所示，则此可知（   ）