[单选题]解决齿轮泵困油现象的最常用方法是:A.减少转速B.开卸荷槽C.加大吸油口D.降低气体温度
[阅读理解]Air pollutionPeople and air pollution are often in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major kind of air pollution is the gas from cars. Statistics (统计资料) show that 93 percent of all auto trips are within cities.Another major kind of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the country.On the average, we throw away more rubbish than the year before. The burning of rubbish makes air pollution even worse. Many major industries are also responsible for the dirty air in the around cities. The fumes (烟) from iron, steel, chemical, and petrol production add particles (微粒) to the air.The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode (腐蚀). In some of the larger cities, these fumes endanger the lives of human beings by contributing to lung diseases and causing early death.1. The key point of the passage is that 回答.A.the cause of air pollution is peopleB.the causes and the effects of air pollution are both found in citiesC.the effects of air pollution range from headaches to death2. What is the purpose of this passage? 回答A.to persuade people to stop polluting the airB.to tell the causes of air pollutionC.to tell why cities are bad places to live3. Why is air pollution more grave in the city than in the country? 回答A.Because there are larger populations in cities.B.Because the air in the city is dirty.C.Because there are much more gas fumes from cars and burning of coal and oil for energy in the city than in the country.4. The fumes from coal and oil may cause metal 回答.A.to corrode B.to twist C.to turn black5. In larger cities, the fumes from coal and oil may contribute to 回答.A.heart disease B.loss of clear vision C.lung diseases
[多选题]我国的基本政治制度有( )(2.0) A、 中国共产党领导的多党合作和政治协商制度 B、 民族区域自治制度 C、 基层群众自治制度 D、 人民代表大会制度
[问答题]醛酮发生亲核加成活性顺序怎样
[判断题]Not all employees believe that they can get a better offer.
[填空题]静定结构在支座移动作用下,( )内力.
[单选题]社会进化论的创使人是( )1章A、孔德 B、斯宾塞 C、迪尔凯姆 D、韦伯
[单选题]在Windows系统中,当启动一个程序或者打开一个窗口后,系统都会在( )中增加一个窗口任务按钮.A、桌面B、开始菜单C、资源管理器D、任务栏
[单选题]以下运算规律不正确的是( )A、 AB=BA B、 ABC=A(BC)C、 AO=OA=OD、 EA=AE=A
[单选题]护士:“早上好,王小姐!昨天晚上睡得好吗?”患者:“护士,我昨天整个晚上都没有合眼,一想到我的病,心理总是不踏实.”护士:“奥,王小姐,其实,你的病没有什么大问题,用不了几天,你就会平安出院的.”此次护患沟通护士最缺乏什么技巧A. 开场技巧 B. 移情技巧 C. 沉默技巧 D. 安慰技巧 E. 提问技巧
[单选题]8051单片机共有( )个中段源优先级. A、 2 B、 3 C、 4 D、 5
[单选题]正确的非语言沟通技巧是: A. 谈话时直视对方的眼睛 B. 边写病历边和患者交流 C. 交流时,使患者处于仰视位 D. 交谈时,身体稍向患者倾斜 E. 双方的距离越近越好
[单选题]下列保护中,属于牵引变压器保护的有( )保护.A、 阻抗B、 距离C、 电流增量D、 瓦斯
[单选题]通过社会知觉获得个体某一行为特征的突出印象,进而将此扩大为他的整体行为特征,这种知觉属于( ). A、 知觉防御 B、 晕轮效应 C、 首因效应 D、 定型效应
[多选题]使用和保养分液漏斗做法 A.分液漏斗的磨口是非标准磨口,部件不能互换使用. B.使用前,旋塞应涂少量凡士林或油脂,并检查各磨口是否严密. C.使用前,旋塞应涂少量凡士林或油脂,并检查各磨口是否严密. D.使用后,应洗净凉干,将各自磨口用相应磨口塞子塞好,部件不可拆开放置.
[单选题]下列醇与金属Na作用,反应活性最大的为 ( ). A.甲醇 B.正丙醇 C.异丙醇 D.叔丁醇
[判断题]在同一生活领域中不同背景的人们也可能会形成不同的制度( )
[单选题]It is _______ that international issues related to food safety will increase.A. probableB. impossibleC. possible
[单选题]机坪按其作用主要可分为两种,其中供飞机掉头使用的是A、 等待坪B、 掉头坪C、 落客坪D、 起飞坪
[判断题]多次观测一个量取平均值可减少系统误差.
[单选题]复曲线测设时,已知主曲线半径为主 R,其切线长为T1,基线长为a,则副曲线半径 副 R为( )A.2/TaR11atg )B.2/Ta21atgR)C.2/T2 2a tgRD.以上都不对