有中间传动轴的轴流通风机机组找正时,检测同轴度时,应转动机组的轴系,每隔()°分别检 发布时间:2019-02-01 21:08 │ 来源:www.tikuol.com 题型:单项选择题 问题: 有中间传动轴的轴流通风机机组找正时,检测同轴度时,应转动机组的轴系,每隔()°分别检测中间轴两端、每对半联轴器两端面之间四个位臵的间隙差。A、45B、60C、90
题型:单项选择题 完形填空 We have many 1 . They are tomatoes, carrots 2 broccoli. Vegetables have many 3 . They are green, red, yellow and white. The green vegetables 4_ the best(最好的 ). We eat many green vegetables 5 . They are good for 6 . And they are 7 food. We can make(做) vegetable salad. I have lots 8 vegetable salad for breakfast. My sister Lucy 9 a baseball player. She likes 10 ,so she eats fruit salad.( )1. A. vegetables ( )2. A. but ( )3. A. names ( )4. A. is ( )5. A. everyday ( )6. A. we ( )7. A. healthy ( )8. A. for ( )9. A. am ( )10. A. fruit B. fruits B. and B. kinds B. are B. every day B. our B. well B. in B. is B. vegetables C. hamburgers C. or C. colors C. be C. everyday's C. us C. health C. of C. are C. ice cream 查看答案
题型:单项选择题 With _____ average of $8,000, daycare costs for babies in the US range from $4,000 to $14,000 a year according to _____ data from National Child Care Center. [ ]A.the; aB. /; theC. an; aD. an; the 查看答案
题型:单项选择题 湿疹的临床表现有()A.湿疹发生在四肢末端有肿胀感B.湿疹发生在眼睑则引起局部高度水肿C.湿疹是多种内外因素相互作用引起迟发型变态反应D.急性湿疹合并感染时可形成脓疱、脓液渗出或结脓痂;瘙痒剧烈。搔抓、热水烫洗可加重皮损E.慢性湿疹患处皮肤增厚、浸润,色素沉着,表面粗糙,覆鳞屑,个别有;苔藓样变,时轻时重 查看答案
题型:单项选择题 1958年中 * * 、国务院提出的教育工作方针是()。A.教育必须为无产阶级政治服务,必须与生产劳动相结合B.教育必须为阶级斗争服务,必须与生产劳动相结合C.教育必须为阶级斗争服务,必须与工农业生产相结合D.教育必须为无产阶级政治服务,必须与社会实践相结合 查看答案
题型:单项选择题 生活在密闭狭小的特殊环境(如潜艇、太空舱)里,氧气会越来越少,二氧化碳会越来越多,因此将二氧化碳转化为氧气,不仅有科学意义,也有重要的使用价值.据文献报道:NiFe2O4在一定条件下既能促进二氧化碳的分解又可重复使用.NiFe2O4在此反应中是( )A.反应物B.致冷剂C.催化剂D.生成物 查看答案