楼面检修，冲洗不当造成底楼冷却泵、过滤泵电机被烧坏的事故。 发布时间：2019-10-16 17:36 │ 来源：www.tikuol.com 题型：问答题 简答题 问题： 楼面检修，冲洗不当造成底楼冷却泵、过滤泵电机被烧坏的事故。
题型：问答题 简答题 完形填空。 I don't like it when people borrow my things and don't return them. My friend borrowed my book and didn't return it1 a year ! I had to ask her three times 2 the book. Then she finally said she couldn't find it 3 bought me a new one. Now I write down 4 people borrow and ask them to return the item when they no longer need it. It drives me mad when people are always late. I have a few friends 5 never on time. I once waited for a friend for two hours !We were supposed 6 a movie together but by the time she got to the cinema, it was already over! And she didn't even call to tell me she 7 late. I was really angry , and I thought it was very impolite of her. So now I phone my friends to remind them 8 on time. It really 9 me angry when people don't let you off the train. I'm trying to get off the train at the station, and people just stand there. Sometimes there are so many people, I have to 10 my way through the crowd. But, usually I ask them politely to move.( )1. A. for ( )2. A. return ( )3. A. so ( )4. A. that ( )5. A. who are ( )6. A. watching ( )7. A. will ( )8. A. came ( )9. A. makes ( )10.A. pull B. in B. to return B. or B. which B. who is B. to watch B. will be B. coming B. keeps B. push C. until C. return back C. and C. the one C. they are C. looking at C. would be C. comes C. leaves C. find D. since D. to return back D. to D. what D. he is D. to look at D. would D. to come D. puts D. see 查看答案
题型：问答题 简答题 设函数F(x，y)在(x0，y0)某邻域有连续的二阶偏导数，且F(x0，y0)=F’x(x0，y0)=0，F’y(x0，y0)＞0，F’’xx(x0，y0)＜0．由方程F(x，y)=0在x0的某邻域确定的隐函数y=y(x)，它有连续的二阶导数，且y(x0)=y0，则 (A) y(x)以x=x0为极大值点． (B) y(x)以x=x0为极小值点． (C) y(x)在x=x0不取极值． (D) (x0，y(x0))是曲线y=y(x)的拐点． 查看答案