题目

如图所示，一根重1.2N的均质米尺，支点O在尺的中央．两端挂起向下的2N和0.5N的外力时，米尺不能在水平位置保持平衡状态，在此情况下要使米尺在水平位置恢复平衡状态，下列做法中可行的是 A. 在y点加2.5N向上的作用力B. 在x点处加3.75N向下的作用力C. 将支点从O点移到x点与O点之间某一适当位置处D. 将支点从O点移到x点与米尺左端之间某一适当位置处根据短文内容及所给提示，补全文中单词或用所给单词的正确形式填空。Wang Mei is my friend . She comes 1.Shanghai . Her birthday is in F2., the second month of the year . She is a 3. ( love ) girl . She can s 4.Chinese and English . Now she lives in Beijing with her parents . We are in the s 5.school . We often go to school together . She is learning something about 6.( country ) this week . She knows more about the U.S. It's s 7.of Canada . The c 8.city of the U. S. is Washington D. C. The flag of the U.S. has stars and stripes . The eagle is its 9.( nation ) animal . The Statue of Liberty is very famous a 10. the world , and the White House is also in the U.S. The president lives in it .