潜艇到底有多复杂？看看潜艇的横截面
33年前奥巴马追到了比自己小3岁的上司米歇尔，2年后二人步入婚姻的殿堂。
50年前的意大利街头，路人对这辆车非常好奇。
上个世纪六十年代，飞机上还有卧铺。
年近40岁的赫本抽烟依然迷人
50年前法国进行一场核试验。
这是世界上最后一只袋狼（塔斯马尼亚虎），它的死亡代表该物种的灭绝。
世界上第一张迪士尼门票售出，1955年售价1美元。
看这两个年轻人是不是很面熟呢？躺着的是拳王阿里，另一个谁看出来了。
这是20多岁的成龙，这身打扮现在也不过时
据胡润排行榜统计，马斯克是历史上首位身价破3000亿美元的人，这是他上大学时的照片。
这是二战德国集中营中的一位，17岁的俄罗斯女孩。由于长期营养不良已经看不出是一个女孩了。
上世纪八十年代的金凯瑞。
原来小罗伯特·唐尼也有年轻的时候
上个世纪60年代，美国阿波罗计划把人类送上月球，这是首席架构师和她的代码。
有钱就在这么任性，开着布加迪去越野。
这块巨石近300吨，在山坡上已经有2000多年的历史。
这是洛克希德公司研制的黑鸟侦察机，由钛合金打造。美苏冷战期间，美国注册假公司向苏联购买钛合金。
1970年，日本生产的第一台电视机，样子好像一个头盔十分可爱。
20岁年轻的拜登
这是穿尿裤的莱昂纳多，他的父母之所以给他起这个名字，是因为他妈妈去卢浮宫时看了莱昂纳多·达·芬奇的画。
1988年，18岁的泰森全身赤膊走在街头，大家注意看他的手里。
铁汉也有柔情的一面，巨石强森的女儿出生时那一刻。
一名模特行走在60年代纽约的街道上，即使60年后的现在依然吸引人的目光。
相信大家都喝过饮料芬达，大你知道它的历史吗？二战期间，德国的可口可乐没有了美国的原料，所以，德国人决定创造一种全新的饮料，取名叫“芬达”。
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班田政4913一个长方体切6刀,可分成24个棱长是1厘米的小立方体,这个长方体的表面积是多少 -
柯利牵19718564841 ______ 其实就是长方体长边可以分为4个(3刀),宽可以分为2个(1刀),高分为3个(2刀)4*3*2=24个立方体 那么表面积为2*(4*2+3*2+4*3)=52平方厘米
班田政4913怎样两刀把一个长方体截成四断?
柯利牵19718564841 ______ 划“十”字
班田政4913把一个长40dm,宽3dm,高2dm的长方体木头平均分成4段后,表面积增加了多少? -
柯利牵19718564841 ______ 切法有三种:竖切、横切、纵切.1.增加了长40dm,宽3dm的6个长方形40*3*6=720(平方分米)2.增加了长40dm,宽2dm的6个长方形40*2*6=480(平方分米)3.增加了长3dm,宽2dm的6个长方形3*2*6=36(平方分米)
班田政4913一块长方体的蛋糕,平均分成四块长方体,有哪几种方法?我要的是8种方法是哪些? -
柯利牵19718564841 ______ 1.横切3刀2,.纵切3刀3.水平切3刀4,纵横各一刀5.水平,纵,各一刀6,水平.横,各一刀7,水平,对角各一刀8.横,立面对角各一刀.9,纵,立面对角各一刀.都能平分为四块.
班田政4913什么是纵切,横切. -
柯利牵19718564841 ______[答案] 所谓切面的方向是这样规定的:拿植物的茎举例,所谓纵切就是沿长轴来切,横切即是垂直与纵切的切法.细胞在切面上分以下几种面,横切面径向面切(弦)相面,径向面是指与圆心连线为半径的的面,切向即使纵切产生的面.分裂的纵分裂横分裂...
班田政4913何谓横切?切片有横切?切片有横切、纵切之分,何谓横切?何谓纵切?
柯利牵19718564841 ______ 横切是指沿器官主轴的垂直方向切割;纵切是指沿器官主轴的平行方向切割.
班田政4913如图,长方形ABCD - A'B'C'D'的长、宽、高分别是a,b,c,用它表示一个蛋糕,横切两刀,纵切一刀…… -
柯利牵19718564841 ______ 分析:与ABCD面积相同的面积之和为2*3*ab,与与AA'B'B面积相同的面积之和为2*2*ac,与AA'D'D面积相同的面积之和为2*3*bc.那么总的面积和即可求得. 解答:解:由题意得,总表面积和=2*3*ab+2*2*ac+2*3*bc, =6ab+4ac+6bc.
班田政4913凌长为1的立方体
柯利牵19718564841 ______ 没有切割的时候表面积为1*1*6=6 分别切了3刀后,相当于增加了六个1*1的平面, 所以总的表面积为6+6=12
班田政4913 下图是茎的横切和纵切示意图,据图回答: (1)标号①为__________,作用是__________.(2)标号②为__________,能够进行__________,形成新的... -
柯利牵19718564841 ______[答案] (1)导管、运输水和无机盐 (2)形成层、分裂 (3)运输有机物
