题目

某同学做“探究互成角度力的合成规律”的实验情况如图甲所示，其中A为固定橡皮条的图钉，O为橡皮条与细绳的结点，OB和OC为细绳。请回答下列问题：(1)根据实验数据在白纸上所作图如图乙所示，乙图中、、F、四个力，其中力________不是由弹簧测力计直接测得的；(2)实验中，要求先后两次力的作用效果相同，指的是________A.橡皮条沿同一方向伸长同一长度B.橡皮条沿同一方向伸长C.橡皮条伸长到同一长度D.两个弹簧测力计拉力和的大小之和等于一个弹判断正误正确涂A，错误涂BThe Magical Brush (《神笔马良》) is a Chinese cartoon movie directed by Frankie Chung. In fact, it is not the only movie about Ma Liang. In 1954 the Shanghai Animation Film Studio produced the movie called Ma Liang and His Magic Brush, and in 1955 the studio produced another movie called Magic Brush.The story is a folklore story. In a village, there lived a boy called Ma Liang. His family was so poor that he could not go to school. However, he loved painting. One day, he got a brush. The brush had magical power—if he drew something with it, the picture would become a real one. This information reached a local office (官员). He put Ma Liang into prison (监狱) and confiscated his brush. The officer asked Ma Liang to draw a golden mountain. Ma Liang agreed, but he also drew a big sea around the golden mountain. After the officer sailed across the sea, Ma Liang waved his brush and the officer fell into the sea.1.There are two movies about Ma Liang mentioned in the passage.2.Ma Liang studied at an art school.3.Ma Liang drew something with his magical brush, and it could become a real one.4.The underlined word “confiscated” means “购买” in Chinese.5.The officer got a golden mountain in the end.