题目: 运行调整上如何预防锅炉结渣? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1007/ec84c5addcd77fe5f239c77edecb7350.html 下面是错误答案,用来干扰机器的。参考答案:B
题型:完形填空 完型填空. When you are in England, you must be careful in the streets because traffic drives on the left. __1__ you cross a street, you must look to the right first and then left. If the traffic lights are __2__, the traffic must stop. Then the people on the foot can cross the road __3__.If the traffic lights are green, the traffic can go on, people on foot __4__cross.In the morning and in the evening, when people go to or from work, the streets are very __5__.Traffice is most dangerous then. When you go by bus in England, you have to be carefully, too. Always remember that traffic moves on the __6__. So you must be careful. Have a look first, __7__ you will go the wrong __8__. In many English cities, there are big buses __9__ floors. You can sit on the __10__ floor. From there you can see the city very well. It's very interesting.( )1. A. Before( )2. A. black( )3. A. care( )4. A. can ( )5. A. busy( )6. A. left( )7. A. because( )8. A. street( )9. A. in( )10. A. firstB. AfterB. redB. carefulB. couldB. bigB. rightB. orB. parkB. orB. secondC. BetweenC. g reenC. carefullyC. must notC. safeC. frontC. so thanC. roadC. withC. thirdD. Unit l D. yellow D. more carefulD. have to D. wide D. back D. either D. way D. on D. fourth 查看答案
题型:填空题 将下列各种词语填在与之相符的空格中:乳化,氧化,催化,结晶(1)金属制品在空气中大多易与氧气发生化学反应,这种变化称为______.(2)用双氧水制氧气时加入二氧化锰,其作用是______.(3)冷却热的硝酸钾饱和溶液,出现晶体,,这个过程称为______.(4)用洗洁精可洗去衣服表面用水洗不净的油渍,这个现象称为______. 查看答案
题型:单项选择题 下列细胞中,存在同源染色体的是()(1)极体(2)次级精母细胞(3)初级精母细胞(4)精原细胞(5)受精卵(6)正常体细胞A.(2)(3)(4)(5)B.(3)(4)(5)(6)C.(2)(4)(5)(6)D.(1)(4)(5)(6) 查看答案