题目

Welcome to the 2015 Winter Camp The 2015 Winter Camp opens between 9: 30 a m and 11:30 a. m .from Feb.5th to Feb. 15th.  A11 children aged 8-14 are welcome.  Each child can take part in only one of the following activities and needs to pay,￥150 for it 1  Sports (basketball, football, table tennis, etc ) 2  Internet Groups (painting online,  piano-learning,  computer study, etc. ) 3  English World (English songs/games/plays, English speaking contest etc.) Some American children are coming to the camp.  If you really want to spend an interesting winter holiday, please join us f下列关于压力的说法，正确的是（　　）A．物体受到的重力就是压力B．压力的大小一定等于重力的大小C．压力的方向总是竖直向下的D．垂直压在物体表面上的力叫压力