面的] comments and felt that the project should be scrapped[抛 弃] since the Roeblings were the only ones who knew how the bridge could be built. In spite of his handicap[身体的不便] Washington was never discouraged and still had a burning desire to complete the bridge and his mind was still as sharp as ever. He tried to inspire and pass on his enthusiasm[激情] to some of his friends, but they were too daunted[气馁的] by the task. As he lay on his bed in his hospital room, with the sunlight streaming through the windows, a gentle breeze blew the flimsy[薄薄的] white curtains apart and he was able to see the sky and the tops of the trees outside for just a moment. It seemed that there was a message for him not to give up. Suddenly an idea hit him. All he could do was move one finger and he decided to make the best use of it. By moving this, he slowly developed a code of communication with his wife. He touched his wife's arm with that finger, indicating to her that he wanted her to call the engineers again. Then he used the same method of tapping her arm to tell the engineers what to do. For 13 years Washington tapped out his instructions with his finger on his wife's arm, until the bridge was finally completed. Today the spectacular Brooklyn Bridge stands in all its glory as a tribute to the triumph of one man's indomitable[不屈不挠的] spirit and his determination[坚定] not to be defeated by circumstances. 〖预览〗 一根鱼竿和一篓鲜活硕大的鱼——哲理故事 从前，有两个饥饿的人得

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管口和试管壁上有水珠生成”。三是用词不当。如在表述某实验现象时用“看到有无色无味的气体生成”这句话就很不妥当，因为无色无味的气体是不可能直接“看到”或者“发现”到的。 　　三. 表述要全面。 　　很多化学反应的现象十分复杂，有些现象易被忽视，导致在表述实验现象时顾此失彼，给实验分析、推断结论带来了困难。因此，为了让学生能全面正确的描述实验现象，首先要引导学生仔细地观察实验现象，必要时，可在精要提示后再重新做一次。如“把CO2通入澄清的石灰水中”的实验现象应表述为“产生大量气泡，同时澄清的石灰水变浑浊”，而不能只表述为“澄清的石灰水变浑浊”;又如描述“石灰石和盐酸反应”时，明显的实验现学象是“有大量气泡生成”，但仅表述这一点是不全面的，还需要提醒学生注意：“不仅有大量气泡产生，而且石灰石也在不断的溶解”。 　　上述是沪江小编为大家提供的关于化学实验现象三要点的相关内容，希望这些能够帮助大家提升对化学实验现象这一考点掌握的有效性。