问题
问答题
有两本厚薄相同的书，你是否想办法把这两本书连在一起，拉也拉不开．如图所示，不能借助任何工具，也不能使书有折痕．并说明其中道理．
答案
答：把两本书每页都交叉叠放，拉开时每一张纸都产生一定大小的摩擦力，这样大大增大了摩擦力，使得人不能拉开．
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有两本厚薄相同的书，你是否想办法把这两本书连在一起，拉也拉不开．如图所示，不能借助任何工具，也不能使书有折痕．并说明其中道理．
答：把两本书每页都交叉叠放，拉开时每一张纸都产生一定大小的摩擦力，这样大大增大了摩擦力，使得人不能拉开．
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| Hello! My name is John. 1 members (成员) are in my family: my parents, my sister and I. My 2 is Frank, and he is 39. 3 phone number is 360-9821. My mother's name is Susan, and 4 is 37. My sister is a nice 5 . She is 6. Her 6 is Sonia. I'm 12. I'm a student (学生). Look! That's my 7 . Is it black? No, it isn't. It's 8 . It's a blue backpack. | ||||
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