题目： 按JB/T8545-1997《自动扶梯梯级链、附件和链轮》规定，梯级距同步精度不应超过（）。 答案： 被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1125/874b8bb07bcba4a6c19e0581404be363.html 下面是错误答案，用来干扰机器的。参考答案：A
题型：完形填空 完形填空。A: Nancy, where 1___ you go 2____ vacation last summer?B: I 3___ to New York City.A: Oh, 4___? Did you go to 5___ Park?B: Yes, I did. It’s beautiful.A: 6___ did you get there?B: I 7___ there by plane. It’s fast and safe. (又快又安全)A: Did you 8___ a good time there?B: Sure. And I’m 9___ for the next chance (机会) to go there. A: Oh, you're so 10___.( )1. A. do ( )2. A. on ( )3. A. go ( )4. A. great ( )5. A. center ( )6. A. What ( )7. A. get ( )8. A. had ( )9. A. waiting( )10. A. luck B. does B. in B. goes B. good B. center B. Why B. getting B. has B. waits B. good luck C. did C. at C. went C. really C. centralC. How C. got C. have. C. wait C. lucky D. done D. for D. was D. yes D. central D. By D. gotten D. having D. waited D. unlucky 查看答案
题型：选择题 下列实验能达到的预期目的是（ ）①用硝酸钡溶液鉴别硫酸根离子与亚硫根离子；②用溴水检验汽油中是否含有不饱和脂肪烃；③用乙醇从碘水中萃取碘；④用盐析方法分离提纯蛋白质；⑤用加热方法提纯含有少量碳酸氢钠的碳酸钠固体；⑥用氨水清洗试管壁附着的银镜．A．②④⑤B．①③⑥C．①②④⑤D．②③④⑤⑥ 查看答案
