[单选题]对表面粗糙影响较大的是A.切削速度B.进给量C.进给量D.以上都不对
[多选题]外包与专业化的主要区别在于( )A.涉及的范围不同B.承担的风险程度不同C.成本费用不同D.对市场反应速度不同
[单选题]美国P&G公司二战后推出“汰涤”牌洗衣粉获得成功,50年代又推出“快乐”牌洗衣粉,这种品牌战略是( ).A.多族品牌B.家庭品牌C.个别品牌D.多品牌
[多选题]预制钢筋砼桩的运输工程为施工图净用量的( ).A.1.015B.1.004C.1.01D.1
[填空题]在计划经济国家,因工死亡社会保险待遇的给付水平取决于死者生前( ).
[填空题]无向简单图G是棵树,当且仅当________________.
[单选题]下列不属于网站内容错误的一项是( ).A.按网站的性质分类B.按网站的服务分类C.网站工作过程分为5个步骤D.要使用Internet,必须连接Internet
[单选题]为了使采样信号y*(t)能完全复现原信号y(t),采样频率f 至少要为原信号最高有效频率fmax的( )倍.A.3B.2C.1.5D.1
[填空题]我国的社会救助主要由( )部门负责.
[单选题]现场施工中,柱子竖向钢筋的连接应优先采用( ).A.闪光对焊B.绑扎连接电渣C.压力焊D.电弧焊
[问答题]抽样调查的主要组织形式.
[阅读理解]A college education is an investment in the future.But it can be a costly investment.The College Board estimates that the costs at four-year public college in the United States increased ten percent this past school year.That was less than the thirteen percent increase the year before,but still much higher than the inflation rate.Public colleges and universities still cost a lot less than private ones. Financial aid often helps.But financial advisers tell parents to start college savings plans when their child is still very young. All fifty states and the District of Columbia offer what are called five-twenty-nine plans.These plansare named after the part of the federal tax law that created them 1996.States use private investment companies to operate most programs.Every state has its own rules governing five-twenty-nine plans.Some of the plans are free of state taxes.And all are free of federal taxes.However,the government could start to tax withdrawals in 2011 if Congress does not change the law. Five-twenty-nine plans include investment accounts that increase or decrease in value with the investments they contain.Families must decide how aggressively they want to put money into stocks, bonds or other investments.Another kind of five-twenty-nine plans begin to pay for their child.s education long before theirchild starts college. This kind of savings program is called a prepaid tuition plan.The money goes into an account to pay for an education at a public college or university in the family.s home state.41.Financial aid can help parents support their children.sA.business plansB.traveling abroadC.future lifeD.college education42.Five-twenty-nine plans are.A.financial aids for familiesB.governed by every stateC.tax laws created in 1996D.plans offered by private investment companies43.Which is NOT true according to the passage A.Five-twenty-nine plans are free of state taxes.B. Five-twenty-nine plans include risky investment accounts.C.Five-twenty-nine plans are named after the part of the federal tax law.D.Five-twenty-nine plans are free of federal taxes.44.A prepaid tuition planA.allows parents to open a bank account in advanceB.allows children to go to college at an early ageC.can save parents a big sum of moneyD.allows parents to pay for their children.s education before starting college45.From the passage,we know thatA.parents.education investment is free of federal taxes in AmericaB.public schools are more popular than private ones in U.S.A.C.all the families in U.S.A.put money into stocks,bonds or other investmentsD. every state has its own state laws in U.S.A.
[问答题]试画出高压断路器、高压隔离器、高压负荷开关的图形和文字符号.
[单选题]跨国公司进行的创新不包括( )A.产品创新B.管理模式创新C.购买力创新D.营销方式创新
[填空题]在发生人身触电事故时,为了解救触电人,可以________,即行断开________但事后必须________.
[单选题]发电机及变压器采用“复合电压起动的过电流保护”作为后备保护是为了A.防止电流或电压互感器二次回路断 线B.防止系统振荡时保护误动C.提高电流电压元件的灵敏度D.防止不平衡电流
[单选题]为维持系统稳定运行,电动机正常启动时,机端电压的最低限值为额定电压的_______. A.64%B.70%C.75%D.80%
[单选题]当负荷电流达到熔断器熔体的额定电流时,熔体将( )A.长延时后熔断B.立即熔断C.短延时后熔断D.不会熔断
[多选题]下列电机属于单边或者双边励磁的电机分别是( )A.电风扇电机B.空调电机C.玩具航模飞机电机D.计算机光驱电机
[单选题]YG15硬质合金刀具常用于切削( )材料A.不锈钢B.耐热钢C.铸铁D.一般钢材
[问答题]配电网的潮流有什么特点