等无功阻抗圆反映了发电机已经处于()运行状态。 A.失磁 B.临界失步 C.异步 D 发布时间:2018-10-05 21:55 │ 来源:www.tikuol.com 题型:单项选择题 问题: 等无功阻抗圆反映了发电机已经处于()运行状态。A.失磁B.临界失步C.异步D.进相
题型:单项选择题 完形填空。 Happiness is for everyone. In fact, happiness is always around you if you care about it. When you are in 1 at school, your classmates will help you; when you study hard at your 2 , your parents are always taking good 3 of you; when you get success (成功), your friends will say congratulations 4 you; when you do something 5 , people around you will help you correct it; and when you do something good to 6 , you will feel happy, too. All these things are 7 . If you pay attention to them, you can see happiness is always 8 you. Happiness is not the same as money. When you are poor, you can say you are very happy, because people can't buy happiness 9 money. When you meetproblems, you can also say loudly you are very happy, because you have many friends to help you.So you can't always say you are poor and you have bad luck. If you agree with me, you can be ahappy and 10 person.( )1. A. pupils ( )2. A. newspapers ( )3. A. friendship( )4. A. to ( )5. A. wrong ( )6. A. us ( )7. A. teachers ( )8. A. within ( )9. A. without ( )10. A. lucky B. trouble B. cards B. knowledgeB. for B. right B. them B. happinessB. between B. on B. good C. room C. lessonsC. our C. on C. badly C. others C. friendsC. around C. by C. able D. office D. books D. care D. by D. worse D. yourself D. parents D. among D. with D. unable 查看答案
题型:单项选择题 金属钛因为有许多神奇的性能而越来越引起人们的关注,它是航空、航天、军工、电力等领域的重要原材料。已知在常温下钛不与非金属及强醣反应,但在加热时却能与常见的非金属单质反应。地壳中含钛的矿石之一是金红石,其主要成分是TiO2,目前用它大规模生产钛的方法是:使金红石与炭粉混合,在高温条件下使其反应,再通入氯气(Cl2),TiCl。和一种可燃性气体。该反应的化学方程式为____________,该反应中的还原剂是____。 查看答案