搜题请搜索小程序“爱下问搜题”
问题 解答题
把1：8的前项和后项都同时乘
1
8
，它的比值不变．______．
答案

根据比的基本性质：比的前项和后项同时乘或除以相同的数（0除外），比值不变．

本题中把1：8的前项和后项都同时乘

1
8
，符合比的基本性质，所以它的比值不变，此题判断为正确．

故答案为：√．

完形填空

One day, about ten years ago, while working at the cash register in the gift shop at my University Museum of Natural History, I saw 小题1:_______   elderly couple come in with a little girl in a wheelchair. As I looked 小题2:________    ( close ) at this girl, I found that she was fixed on her chair. I then realized she had no arms or legs, just a head, a neck and upper body, 小题3:_______   ( dress ) in a little white skirt. As the couple wheeled her up to me, I turned my head toward the girl. When I took the money from her grandparents, I looked back 小题4:________ the girl, who was giving me the most optimistic, largest smile I had ever seen. All of a sudden, her handicap was gone and all I saw was this beautiful girl, 小题5:________   smile just melted me  小题6:_______   almost instantly gave me a completely new sense of   小题7:_______   life is all about. She took me from a poor, unhappy college student and   小题8:___________   ( bring ) me into her world; a world of smiles, love and   小题9:__________  ( warm ). I’m a successful business man now and whenever I think about the troubles of the world, I think about that little girl and the remarkable lesson about life that she taught  小题10:_________   .
查看答案
单项选择题 A1/A2型题

下述对上颌尖牙牙冠唇面形态的描述，不正确的是（）

A.尖牙唇面形态呈五边形

B.两条牙尖嵴相交成90°

C.唇轴嵴较明显

D.唇面外形高点在颈1／3处

E.唇面分为两个斜面
查看答案