题干

将质量为2kg 的物体挂在弹簧秤上,当物体浸在水中时称弹簧秤示数为11.2N,则此时物体受到浮力大小是____N,方向是竖直向上,施力物是____.
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答案(点此获取答案解析)

8.4,水

同类题1

阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、 D四个选项中,选择最佳选项。

How to Be a Better Student

    Maybe you are a common student. You probably think you will never be a top student. This is not necessary so, however. Anyone can become a better student if he or she wants to. Here's how:

Plan your time carefully. When you plan your week, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First set your time for eating, sleeping, dressing, etc. Then decide a good, regular time for studying. Don't forget to set aside enough time for entertainment. A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time.

    Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television! When you sit down to study, concentrate on the subject.

    Make good use of your time in class. Take advantage of class time to listen to everything the teachers say. Really listening in class means less work later. Taking notes will help you remember what the teacher says.

    Study regularly. When you get home from school, go over your notes, review the important points that your teacher is going to discuss the next day, read that material. This will help you understand the next class. If you do these things regularly, the material will become more meaningful, and you will remember it longer.

    Develop a good attitude about tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won't end if you don't pass a test, so don't be over worried.

    There are other methods that might help you with your studying. You will probably discover them after you have tried these. 

同类题2

阅读下文,回答问题

故乡(节选)

    我这时很兴奋,但不知道怎么说才好,只是说:“阿!闰土哥,——你来了?……”

    我接着便有许多话,想要连珠一般涌出:角鸡,跳鱼儿,贝壳,猹……但又总觉得被什么挡着似的,单在脑里面回旋,吐不出口外去。

    他站住了,脸上现出欢喜和凄凉的神情;动着嘴唇,却没有作声。他的态度终于恭敬起来了,分明的叫道:“老爷!……”

    我似乎打了一个寒噤;我就知道,我们之间已经隔了一层可悲的厚障壁了。我也说不出话。

    他回过头去说,“水生,给老爷磕头。”便拖出躲在背后的孩子来,这正是一个廿年前的闰土,只是黄瘦些,颈子上没有银圈罢了。“这是第五个孩子,没有见过世面,躲躲闪闪……”

    母亲和宏儿下楼来了,他们大约也听到了声音。

    “老太太。信是早收到了。我实在喜欢的了不得,知道老爷回来……”闰土说。

    “阿,你怎的这样客气起来。你们先前不是哥弟称呼么?还是照旧:迅哥儿。”母亲高兴的说。

    “阿呀,老太太真是……这成什么规矩。那时是孩子,不懂事……”闰土说着,又叫水生上来打拱,那孩子却害羞,紧紧的只贴在他背后。

    “他就是水生?第五个?都是生人,怕生也难怪的;还是宏儿和他去走走。”母亲说。

    宏儿听得这话,便来招水生,水生却松松爽爽同他一路出去了。母亲叫闰土坐,他迟疑了一回,终于就了坐,将长烟管靠在桌旁。