题目:
如何确定滑轮组的省力倍数?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D
如何确定滑轮组的省力倍数?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0628/06869385aa511bd784ed2355869f46a2.html
下面是错误答案,用来干扰机器的。
参考答案:D
下列有关金属和金属材料的认识中,不正确的是( )
A.生铁和钢的性能相同
B.赤铁矿的主要成分是氧化铁
C.回收废旧金属有利于节约资源
D.铁粉做“双吸剂”和铁生锈原理相同
右图为“相同降水量下的城市化前后地表径流过程曲线”读图回答6一7题。
小题1:关于甲、乙两条曲线的叙述正确的是
①甲代表城市化前的地表径流曲线 ②乙过程有利于地下水的补给 ③甲的长期后果可能造成城市水荒 ④乙过程下渗量小于甲过程
A.①② B.①③ C.②③ D.②④
7.甲曲线最大值提前于乙曲线最大值的主要原因是
A.天然调蓄能力强 B.城市热岛效应
C.下垫面透水能力好 D.植被覆盖率降低
Window Bill and John,both seriously ill,lived in the same room at Marie Hospital.John lived next to the only window of the room and was allowed to 36 in his bed and watch for an hour every day.But Bill had to spend all his time 37 on his back. They became friends soon and talked for hours every day.They spoke of their families,their children,their hobbies,and their 38 in the American army.Each day John would sit up and 39 to his roommate Bill what he could see outside the window. Through John’s description,Bill’s world was 40 and brightened by all the activities and colors of the outside world.The window overlooked a beautiful park with a lovely 41 ,John told Bill.Ducks played on the water 42 children sailed their model boats.And a fine view of the city skyline could be seen in the distance.As John described all these 43 ,Bill would close his eyes and 44 the picturesque scene.Bill was recovering 45 . However,John became weak day by day. Late one night,Bill was lying in bed 46 the ceiling when John began to cough seriously.Then doctors and nurses rushed to the room.Thirty minutes later, John 47 coughing.Now,there was only silence— 48 silence. The following morning,Bill was moved to the bed next to the window at his request.Slowly and 49 ,he supported himself up on one elbow (胳膊)to take the first look.But to his 50 ,he could see nothing but a 51 wall. Only at that moment did he begin to realize that the pursuit(追求)of happiness was a matter of 52 .It was a positive attitude we chose to express.It was not a gift that was 53 to our doorstep each morning,nor did it come through the window.It was all inward journey.Whether a man is happy or not depends on his own thoughts 54 anything outward. So Bill began to describe the 55 world to his new roommate that he saw through the only window of the room.
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当曲柄销中心线与主轴颈中心线不平行时,活塞运动部件在气缸中发生()失中。
A.左、右方向
B.横向
C.纵向
D.任意方向
【真题试题】 (2009年多项选择第58题)公安机关在侦查甲涉嫌盗窃罪一案时,搜查了甲的住处,并对获取的有关物品进行了扣押。关于本案的扣押行为,下列表述正确的是( )。
A.进行扣押时,应当出示扣押证
B.应当有见证人和被扣押物品持有人在场
C.应当当场开列扣押物品清单
D.如查明扣押的物品与本案无关,应当在5日以内解除扣押