题目:
As is known to all, waste has become a more and more serious problem. We can easily see many people throw a lot of food into the garbage can. Some people spend thousands of yuan buying fashionable clothes. What do you think of them? Here are some of students’ opinions:
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答案:
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为防止液体沸腾时溅出伤人,给试管里的液体加热,液体体积一般不超过试管容积的13,为操作安全、方便,试管夹应从试管的底部套入,给试管里的液体加热时,试管夹应夹在离试管口约13处;为避免试管内的液体沸腾喷...