离心泵提倡关排出阀启动是因为这时泵的（）。A．扬程最低 B．效率最高 C．启动功率最 发布时间：2017-07-18 10:44 │ 来源：www.tikuol.com 题型：单项选择题 问题： 离心泵提倡关排出阀启动是因为这时泵的（）。A．扬程最低B．效率最高C．启动功率最小D．工作噪声最低
题型：单项选择题 阅读理解。 Jack Brown, an office worker, lives in Washington. He inherited (继承) a million dollars when he was23, but he wasn't happy at all. When his college friends were looking for their jobs, he didn't have to. Jack decided to keep living a simple life like everyone else. He gave $ 10,000 of his money to a charity to help poor children live a better life. Today he is 36. He still wears cheap shoes and clothes and drives a small car only, but he is very happy. Up to now Jack has helped some children from poor countries all over the world, by sending them each $ 200 a month. The money was used for the children's study, food, medicine and clothing. Jack receives areport each year on the children's progress. They can write to each other, but usually the children do not speak English. When Jack first heard about these children, he wanted to help them. "It was nothing special." he said,"Until I went to these countries and met the children I was helping, I didn't know anything about their life." Once Jack went to meet a little girl in Africa. He said that the meeting was very exciting. "When I met her, I felt very, very happy." he said. "And I saw that the money was used for a good cause. It brought mehappiness. I want to do everything I can to go on helping those children." 1．Jack didn't need to look for a job _______. [ ]A. before he went to college B. after he went to Africa C. because he got one million dollars D. before he received a report 2．Jack has sent them each $ 200 a month to help some poor children _______. [ ]A. only in WashingtonB. only in England C. only in Africa D. around the world 3．Jack learned about the children's progress by _______. [ ]A. visiting them each year B. getting a report every year C. staying with them D. talking to them in English 4．The underlined (画线的) words "for a good cause" means "_______" in Chinese. [ ]A. 施舍 B. 行善 C. 优惠 D. 赏赐 5．What's the main idea of the story? [ ]A. Help others, and you will feel happy.B. It's necessary to write letters to poor children. C. Live a simple life, and you can give others help D. It's the most important to help the children in Africa. 查看答案
题型：单项选择题 从下面方框中选择一个适当短语填空，使句子意思完整，所选词组只用一次。as for depend on be stressed out take a vcation worry about leave for1. My family and I _______ this summer. 2. He ________ and wants to relax. 3. I like doing sports, ______ playing chess, I don't like it. 4. Good health ________ good food, exercise and enough sleep. 5. My teacher is ill, we are all _______ him. 查看答案
题型：单项选择题 关于巴金代表作《家》的人物阐述不正确的一项是A．高老太爷是封建大家庭的维护者，他专制、冷酷、虚伪，把鸣凤送给冯乐山，导致鸣凤投水自尽，但他对自己的行为充满了自信。B．高克定是封建大家庭的维持者，高克定的身份是个律师，由于长兄的缺席，他自觉地充当起了长兄的职责，承担起维持者的责任。C．瑞珏和鸣凤等女性是封建大家庭的受害者，这些女性美丽却遭遇了不幸。作品正是通过美的毁灭，深刻地控诉了封建家族的罪恶。D．觉慧对封建制度嫉恶如仇，关心国家的前途，积极投身于社会活动，但他又有“幼稚”的一面，过高地估计了个人反抗的作用。 查看答案
题型：单项选择题 下列关于中国煤炭资源的说法正确的是( )。A．中国煤炭资源北多南少，东多西少B．中国适于露天开采的煤炭储量少，仅占总储量的47%左右C．神府、东胜煤田所出产烟煤的原煤灰分仅为3%—5%，被誉为天然精煤D．华东地区的煤炭资源储量的87%集中在安徽、山西；中南地区煤炭资源的72%集中在河南 查看答案