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阅读理解。 It is probably the strangest sport anyone has ever invented.And at first sight,it looks like the easiest. Competitors have to do two things.The first is to stand still.The second is to place their hands anywhere on the body of a car,and keep it there. This is where things start getting difficult.Lots of people are doing the same thing.And the winner of the 'handathon' contest is the person who can carry on doing it for the longest time.That person gets to own the car. It still seems to be an easy thing to do.At the beginning it is.Anyone can stand still.But when the contest has been going for four or five days,standing still seems like the most difficult job in the world. And keeping the hand in place over this time becomes an act of serious attention.After a few days,the hand seems to belong to someone else-someone who wants to go home and get some sleep. Competitors are allowed to take a five-minute break every hour to eat,drink or do whatever else is necessary.No one is allowed to lean on the car for support.Winners need to be able to show great powers of attention.They also need to be able to develop special skills. Maybe the popularity of the handathon is due to the fact that it is not necessary to be a trained athlete to enter.Entrants in the Longview handathon certainly don't seem to do much preparation.Most say they will prepare by 'getting lots of sleep'.Others say they will 'eat healthy food' or 'pray for success'.The whole event gives ordinary people the chance to do something interesting and win something in the end. Handathons are competitions,but there is little rivalry (敌对) between competitors.They help each other out and keep each other's spirits up.People who drop out early return with food,drink and encouragement. 1.The reason why the sport is called 'handathon' is that competitors ______. A. cover a long distance B. keep hands in place for long C. wave hands as long as possible D. do the same thing as in a marathon 2.What ability is likely to be needed most in a handathon? A. Standing without any support. B. Not leaning on the car. C. Eating and drinking in five minutes. D. Having strong powers of attention. 3.Why is handathon popular? A. Someone can win with special training. B. It doesn't need to make any preparation. C. Anyone who is interested can join in it. D. People get along well with each other in it. 4.What is the writer's opinion about handathon? A. It is not as easy as it looks at first. B. It is the easiest of all sports. C. It can purify people's spirits. D. It is not good competing in a handathon. 5.Which of the following about handathon is not right? A. The person who takes part in it should stand still. B. The person who takes part in it has to place his hands anywhere on the body of a car,and keep it there. C. The person who takes part in it can have a break during the course of the competition. D. Handathons are competitions,so competitors don't encourage each other.
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【判断题】高速公路路面混凝土用水泥的铝酸三钙含量不宜大于7%。
A.
正确
B.
错误
【单选题】8位PCM码的排序为P1 P2 P3 P4 P5 P6 P7 P8,其中P2 P3 P4表示
A.
取样值
B.
量化值
C.
极性码
D.
段落码
【单选题】A、B两个投资方案的项目计算期不同,且只有现金流出而没有现金流入,评价A、B两个方案的优劣宜采用的方法是( )
A.
比较两方案的净现值
B.
比较两方案的内含报酬率
C.
比较两方案的现值指数
D.
比较两方案的年均流出现值
【单选题】8位PCM码的排序为:P1P2P3P4P5P6P7P8,其中P1表示( ),P2P3P4表示( ),P5P6P7P8表示( )
A.
段内码
B.
极性码
C.
量化值
D.
段落码
【单选题】在(7,4)海明校验码中p1p2b1p3b2b3b4p4b5b6b7,其中海明码P1=( )。
A.
b1⊕b3⊕b4⊕b6⊕b7
B.
b1⊕b2⊕b4⊕b5⊕b7
C.
b2⊕b3⊕b4
D.
b5⊕b6⊕b7
【简答题】例 3- 1 对表 3 - 4 中二维数据,使用 k-means 算法将其划分为 2 个簇,假设初始簇中心选为 P7(4 , 5) , P10(5 , 5) 。 给出聚类之后的簇 C 1 、 C 2 的样本集合?和他们的簇中心? 表 3 - 4 k-means 聚类过程示例数据集 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 x 3 3 7 4 3 8 4 4 7 5 y 4 6 ...
【单选题】关于空心桥墩的构造尺寸,说法错误的是( )。
A.
墩身最小壁厚,对于钢筋混凝土不宜小于30 cm,对于素混凝土不宜小于50 cm
B.
墩身内应设横隔板或纵、横隔板,对40 cm以上的高墩,不论壁厚如何,均按6~10 m的间距设置横隔板
C.
墩身周围应设置适当的通风孔与泄水孔,孔的直径不宜小于10 cm
D.
薄壁空心墩的一般配筋率在0.5%左右
【单选题】据2010年11月出版的英国《自然》杂志报道:最近,欧洲核子研究中心的科学家成功制造出数十个反氢原子,并利用特制的“磁瓶”(瓶中存在特殊磁场)成功地使这些具有一定磁性的反氢原子保存了较长时间,这是人类首次捕获到反物质.反物质是由反粒子构成的,反原子中质子带负电,电子带正电.科学家指出反物质与自然界的正物质一旦接触,就会相互抵消而湮灭,并发生爆炸同时放出巨大能量,500g反物质的破坏力可能超过目前世...
A.
反氢原子是由一个带负电的质子和一个带正电的电子构成的
B.
“磁瓶”中的特殊磁场可防止反氢原子撞上瓶壁而与瓶壁中的正物质发生湮灭现象
C.
物质与反物质相遇而湮灭所发生的变化属于化学变化
D.
反物质在能源研究领域中前景可观,可能成为未来世界的新能源
【判断题】高速公路路面混凝土用水泥的铝酸三钙含量不宜大于7%。
A.
正确
B.
错误
【单选题】关于芽胞,下列说法错误的是?
A.
芽胞是某些细菌在其生长发育后期,在细胞内形成的厚壁、含水量低、抗逆性强的休眠体构造
B.
芽胞由胞外壁、芽胞衣、皮层和核心组成
C.
皮层的充分膨胀和核心的高度失水导致了芽胞极强的耐热性
D.
产生芽胞的大多数为革兰氏阴性菌
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