【单选题】【消耗次数:1】
The city ______ its birth-rate by almost 60% in the past 20 years.
cuts
has been cut
cut
has cut
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相关题目
【单选题】 The city ____ its birth-rate by almost 60% in the past 20 years.
①  cuts
②  has been cut
③  cut
④  has cut
【单选题】 The new cut in interest rate ____ promote domestic investment.
①  means to
②  directs toward
③  is meant to
④  leads to
【单选题】 The new cut in interest rate _____promote domestic investment.
①  means to
②  directs toward
③  is meant to
④  leads to
【单选题】 Tom has been a vegetarian ____ principle for years.
①  in
②  on
③  for
④  by
【判断题】 He has been in china for three years.
①  正确
②  错误
【单选题】 The population of many Alaskan cities has __________ doubled in the past three years.
①  larger than
②  as great as
③  more than
④  as many as
【判断题】 The population of beijing has been increased for ten years.
①  正确
②  错误
【单选题】 he park has been built and it will be open _____ three years
①  A. in
②  B.for
③  C.on
④  D.after
【单选题】 Its ( ) that he has been away from home.
①  evident
②  important
③  genuine
④  alternative
【单选题】 The birth rate of the country decreases ______ with years.
①  extremely
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随机题目
【简答题】 联条的作用是将[填空]串联起来。
【单选题】 活塞由上止点运动到下止点,活塞顶部所扫过的容积是指:( )。
①  气缸工作容积
②  燃烧室容积
③  气缸最大容积
④  内燃机排量
【单选题】 在同一转速时,节气门的开度越大,则发动机的负荷( )。
①  越大
②  越小
③  不变
④  不一定
【单选题】 发动机在某一转速发出的功率与同一转速下所可能发出的最大功率之比称之为( )。
①  发动机工况
②  有效功率
③  工作效率
④  发动机负荷
【判断题】 多缸发动机各气缸的工作容积之和,称为发动机排量。
①  正确
②  错误
【判断题】 发动机总容积越大,它的功率也就越大。
①  正确
②  错误
【判断题】 活塞行程是曲柄旋转半径的2倍。
①  正确
②  错误
【判断题】 活塞顶是燃烧室的一部分,活塞头部主要用来安装活塞环,活塞裙部可起导向的作用。
①  正确
②  错误
【判断题】 对于四冲程发动机,无论其是几缸,其作功间隔均为180°曲轴转角。
①  正确
②  错误
【判断题】 气环的密封原理除了自身的弹力外,主要还是靠少量高压气体作用在环背产生的背压而起的作用。
①  正确
②  错误