题目

如图，物体A和B质量分别为mA=4kg，mB=6kg，滑轮、绳子及弹簧秤C的质量不计，滑轮处摩擦不计，g取10m/s2 ． 则弹簧秤示数为（ ） A . 48N B . 32N C . 62N D . 20N 答案：AHe didn’t put the things________they belonged，for________he got his punishment. A．which；that 　 B．what；this　　　 C．that；whose　 　D．where；which