一个下午,我们生物组的同学进行了一次蜗牛力气有多大的有趣的观察实验。事先我们捉来了10多只小蜗牛,随便取了其中3只,分别编上1、2、3号。先称出1号蜗牛是1.7克重,然后用棉线拴住蜗牛的外壳,棉线另一头拴上一个10克重的砝码,放在玻璃板上让蜗牛去拉,只见蜗牛毫不费力地拖着砝码向前爬行。把砝码加到110克,蜗牛还是若无其事地挥动着一对触角向前爬行。当砝码加到170克时,它就十分吃力,一次,两次,费了很大的劲,终于向前拖动了。再给它加上5克砝码,这时,它虽然拼命向前使劲,身体伸得很长,差不多整个身体快要脱离壳了,一用劲,被拉长的身体竟向后倒滑起来。可是它还是不服气,一次,两次,三次,每用一次劲,身体就向后滑。就这样,拉了 One afternoon, students in our biology group conducted an interesting observation experiment about how energetic snails work. Prior to our capture more than 10 small snails, just take 3 of them, respectively, compiled No. 1,2,3. The first No. 1 snail is said to be 1.7 grams, and then use a cotton thread to snail the shell, the other end of the cotton thread tied to a weight of 10 grams, on the glass to allow the snail to pull, I saw the snail effortlessly Drag the weight crawling forward. Add the weight to 110 grams, the snail still quietly waving a pair of antennae to crawl forward. When the weight added to 170 grams, it is very difficult, once, twice, took a lot of energy, and finally dragged forward. Give it a weight of 5 grams. At this moment, though it desperately strives forward, the body stretches for a long time. Almost the whole body is about to leave the shell, and with great exertion, the elongated body actually slides backwards. But it is still not convinced, once, twice, three times, each with a strong, the body slid backwards. In this way, pulled