锗晶体和硅晶体外围有四个电子，可形成（）。 A.共价键 B.金属键 C.离子键 D. 发布时间：2018-11-24 12:52 │ 来源：www.tikuol.com 题型：单项选择题 问题： 锗晶体和硅晶体外围有四个电子，可形成（）。A.共价键B.金属键C.离子键D.氢键
题型：单项选择题 完形填空：阅读短文，并从四个选项中，选择正确的答案。 My father 1 a good friend in the factory (工厂). He is sixty. He is an old man. All of the children like him. We call 2 Uncle Sam. He 3 from England. He 4 in Sichuan. He can't 5 Chinese. We teach (教) him Chinese. He 6 us English. He 7 work on Sundays. He 8 making things. And he likes watching TV with his children at night. ( )1. A. have ( )2. A. he ( )3. A. come ( )4. A. live ( )5. A. speak ( )6. A. teach ( )7. A. do ( )8. A. likes B. haves B. they B. comes B. living B. tell B. teachs B. don't B. like C. has C. him C. goes C. lives C. say C. teaches C. does C. to like D. is D. his D. to come D. to live D. talk D. teaching D. doesn't D. liking 查看答案
题型：单项选择题 鳃裂囊肿的主要特点是（）。A.位于颈部软组织内B.囊壁内衬复层扁平上皮C.纤维囊壁内含大量淋巴样组织并形成淋巴滤泡D.纤维囊壁可见甲状腺或黏液腺组织E.囊腔内有较多脱落角化物 查看答案