高级
和爆炸时间,并且有 专门一个人管炸弹的引信,设定几秒钟后爆炸。 这样一个系统是比较复杂的,维纳在研究过 程中,提出了一个重要概念:负反馈。 咱们搞自动控制的都知道,一个控制系统中,负反馈 回路可以使得系统稳定,正反馈使得系统发散。 科学就是科学,她是热情而又冰冷的。 就像一个高傲的淑女,在你摸不着门道的时候, 她对你冷酷无情,不管你费多少精力也都白搭;而当你掌握了她的规律脾气的时候 ,她会向
61. 在任何力的作用下,保持大小和形状不变的物体称为( ) ; 62. 在空间受到其它物体限制,因而不能沿某些方向运动的物体,称为( ); 63. 能使物体运动或产生运动趋势的力,称( ); 64. 将滚动轴承的一个套圈固定,另一套沿径向的最大移动量称为( ); 65. 轴承在使用中滚子及滚道会磨损,当磨损达到一定程度,滚动轴 承将( )而报废; 66. 圆锥齿轮装配后,无负荷检验接触点时
ails against. Nevertheless, he now believes that the automakers with the deepest pockets have best chance of building better cars for tomorrow. “ The new, clean cars will emerge not from a tinkerer’s
an be concluded from the passage that the author_______. (A) does not reveal his personal view towards the use of renewable energy (B) makes a systematic parison between nonrenewable energy and
secret report about its poor image (C) it is losing many of its best employees (D) it has received much criticism from its consumers 2. The word“ exacerbated” in the sentence“ It notes that relations
nizations sympathizes with Tesco? (A) The Liberal Democrats (B) The National Consumer Protection Council (C) The National Farmers‘ Union (D) The Labour Party 7 4. The expression ―in the pockets of‖
lies (D) she needed the money from surrogate parenting 2. The word ―row‖ in the sentence ―there was a lengthy row between the two sides‖ () can be replaced by ________. (A) negotiation (B) argument
ces in the World Trade Center (C) had employed Bent before 1998 (D) had stopped publication after the attack on the World Trade Center 2. According to the passage, the Pulitzer Prizes . (A) are
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tion. (B) How a baby learns to walk and talk. (C) Ambition can be taught like other subjects at school. (D) Some teenage children lose their drive to succeed. 2. According to some educators and