题干

如图,为了测量某障碍物两侧A,B间的距离(此障碍物阻挡了A,B之间的视线),给定下列四组数据,测量时应当用数据

A:α,a,b

B:α,β,a

C:a,b,γ

D:α,β,b  

上一题 下一题 0.0难度 选择题 更新时间:2020-03-29 10:45:39

答案(点此获取答案解析)

C

同类题4

阅读下文,回答问题

只想和你接近

    在我十六岁离家之前,我们一家七口全睡在同一张床上——那种把木扳架高,铺着草席,冬天加上一层垫被的通铺。

    这样的一家人应该很亲近吧?没错。不过,不包括父亲在内。

    父亲可能一直在摸索、尝试与孩子们亲近的方式,但老是不得其门。同样的,孩子们也是。

    小时候特别喜欢父亲上小夜班的那几天,因为下课回来时他不在家。因为他不在,所以整个家就少了莫名的肃杀和压力,妈妈准确地形容是“猫不在,老鼠呛秋”。

    午夜父亲回来,他必须把睡得横七竖八的孩子一个个搬动、摆正之后,才有自己可以躺下来的空间。

    那时候我通常是醒着的。早就被他开门闩门的声音吵醒的我通常装睡,等着洗完澡的父亲上床。

    他会稍微站定观察一阵,有时候甚至会喃喃自语地说:“实在啊睡成这样!”然后床板会轻轻抖动,接着闻到他身上柠檬香皂的气味慢慢靠近,感觉他的大手穿过我的肩胛和大腿,整个人被他抱起来放到应有的位子上,然后拉过被子帮我盖好。

    喜欢父亲上小夜班,其实喜欢的仿佛是这个特别的时刻——半分钟不到,却是完全满足的亲近。

    长大后的某一天,我跟弟弟妹妹坦承这种装睡的经历,没想到他们都说:“我也是!我也是!”

    或许亲近的机会不多,所以某些记忆特别深刻。

    有一年父亲的腿被落盘压伤,伤势严重到必须从矿工医院转到台北的一家外科医院治疗。 由子住院的时间很长,妈妈得打工养家,所以他在医院的情形几乎没人知道。某个星期六的中午我放学之后,不知道是什么样的冲动,我竟然跳上开往台北的火车,下车后从火车站不停地问路走到那家外科医院,然后在挤满六张病床和陪伴家属的病房里,看到一个毫无威严、落魄不堪的父亲。

    他是睡着的,四点多的阳光斜斜地落在他消瘦不少的脸上。他的头发没有梳理,既长且乱,胡子也好像几天没刮的样子;打着石膏的右腿露在棉被外,脚指甲又长又脏。

    不知道为什么!我想到的第一件事竟然就是帮他剪指甲。护士说没有指甲剪,不过可以借给我一把小剪刀;然后我就在众人的注视下,低着头,忍住一直冒出来的眼泪,小心地帮父亲剪指甲。

    当我剪完所有的指甲,抬起头才发现,父亲不知道什么时候已经睁着眼睛看着我。 “妈妈叫你来的?”“不是。”“你自己跑来没跟妈妈说?”“没有。”

    直到天慢慢转暗,外头霓虹灯逐渐亮起来之后,父亲才开口说:“暗了,我带你去看电影,你晚上就睡这边吧!”

    那天夜晚,父亲一手撑着我的肩膀,一手拄着拐杖,小心穿越周末熙攘的人群,走过长长的街道,带我去看了一场电影。

    一路上,当我不禁想起小时候和父亲以及一群叔叔伯伯,踏着月色去九份看电影的情形时,父亲正好问我:“记不记得小时候我带你去九份看电影?”

    那是我人生第一次一个人到台北,第一次单独和父亲睡在一起,第一次帮父亲剪指甲,却也是最后一次和父亲一起看电影。

    那是一家比九份升平戏院大很多的电影院,叫远东戏院。那天上演的是一部日本片,导

    演是市川昆,片名叫“东京世运会”。

    片子很长,长到父亲过世二十年后的现在,它还不时在我脑海里上演着。

(吴念真/文,有删改。)

同类题5

完形填空

    The Fitting-in of Suzy Khan

    The first time I saw Suzy Khan, I knew I had to help her. She was really small for her age of 12. The boy in my class often1about her and laughed their heads off. She would open a book, pretending to read, with tears dropping on the open page.

    All I knew was that she was an orphan(孤儿) from Africa. She had just been adopted by a family in town who2that the best way for her to learn American ways of life was to be with American kids. I looked down at this 3girl and promised myself that somehow I would help her.

    But how could I help her4in with us? There had to be a5

    One day, when I went into the classroom, I saw that Suzy had6her geography book to a picture of a train, and in her notebook, she had made a(n)7copy.

    I was surprised and thought that she could do something in the coming 8show. So, I took her to see the art teacher, Miss Parker, and showed her what Suzy had 9"Why, it's wonderful," said Miss Parker, who then showed us a poster she had painted10the talent show. "I need more of these, but I just don't have enough11Could you help me, Suzy?"

    On the day of the talent show, Suzy's12were everywhere—all over the hall and all over the school, each one different.

    "And finally," said Mr. Brown, the schoolmaster, at the end of the show, "we have a(n)13award. I'm sure you've all noticed the wonderful posters." Everyone nodded. "One of our own students14them."

    I could hear everyone whispering. "Who in our school could draw15well?"

    Mr. Brown waited a while before saying, "16this student worked so hard on the posters, she deserves a17 too. Our mystery(神秘) artist is our new student—Suzy Khan!"

    Mr. Brown thanked her for all the wonderful posters and gave her a professional artist's set. "Thank you," she cried.

    I18 at that time when I was looking at her excited face, she'd probably never19anything in her whole life.

    Everyone started to20their hands. Suzy Khan gave them a shy smile and the applause was deafening. I knew then Suzy was going to be all right.