题目:
当接合套和()之间间隙过大时,可能造成变速器难以接合档位接合齿圈。
答案:
参考答案:拨叉
当接合套和()之间间隙过大时,可能造成变速器难以接合档位接合齿圈。
参考答案:拨叉
Put an ice cube from your fridge into a glass of water. You have a piece of string(线) 10 centimeters long. The problem is to take out that piece of ice with the help of the string. But you must not touch the ice with your fingers.
You may ask your friends to try to do that when you are having dinner together. There is a saltcellar on the table. You must use salt when you carry out this experiment.
First you put the string across the piece of ice. Then put some salt on the ice. Salt makes ice melt(融化). The ice round the string will begin to melt. But when it melts, it will lose heat. The cold ice cube will make the salt water freeze(结冰) again.
After a minute or two you may raise the piece of string and with it you will raise your piece of ice!
This experiment can be very useful to you. If, for example, there is ice near the door of your house, you must use very much salt to melt all the ice. If you don’t put enough salt, the water will freeze again.
小题1:We must use when we carry out this experiment.
A.a fridge
B.some food
C.a table
D.some salt小题2:How long will it take to carry out this experiment?
A.More than three minutes.
B.Five minutes or two.
C.Only one minute or two.
D.About ten minutes.小题3:We can learn something about from the passage.
A.physics
B.biology
C.chemistry
D.maths
完形填空。 阅读下面短文,从短文后所给各题的四个选项(A、B、C和D)中,选出可以 填入空白处的最佳选项,。 | ||||
One night I decided to spend some time building a happier and closer relationship with my daughter. For several weeks she had been 1 me to play chess (棋) with her, so I suggested a game and she eagerly 2 . It was a school night, however, and at nine o’clock my daughter asked if I could 3 my moves, because she 4 to go to bed; she had to get up at six in the morning. I 5 she had strict sleeping habits, 6 I thought she ought to be able to 7 some of this strictness. I said to her, " 8 , you can stay up late for once. We’re having 9 ." We played on for another fifteen minutes, during which time she looked 10 . Finally she said, "Please, Daddy, do it quickly." "No," I replied. " If you’re going to play it 11 , you’re going to play it slowly." And so we 12 for another ten minutes, until 13 my daughter burst into tears, and 14 that she was beaten. Clearly I had made 15 . I had started the evening wanting to have a 16 time with my daughter but had 17 my desire to win to become more 18 than my relationship with my daughter. When I was a child, my desire to win 19 me well. As a parent, I 20 that it got in my way. So I had to change. | ||||
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如图所示,将弹簧K的一端与墙相连,质量为4kg的木块沿光滑的水平面以5m/s的速度运动并压缩弹簧K,求弹簧在被压缩的过程中,最大的弹性势能及木块的速度减为3m/s时弹簧的弹性势能。
建设工程项目决策阶段策划的基本内容不包括()。
A.管理策划
B.项目目标论证
C.设计策划
D.合同策划
女性,60岁,慢性咳嗽、咳痰4年,每年冬季发作,多持续3~4个月,近两周来再次出现咳嗽、咳痰,为白黏痰,无发热和呼吸困难。查血常规、尿常规正常,胸片示双肺纹理增多、紊乱,肺功能:FVC正常,FEV1/FVC正常,FEV1正常,DLCO正常。最恰当的诊断是
A.慢性阻塞性肺疾病
B.肺结核
C.支气管哮喘
D.支气管扩张
E.慢性支气管炎