单词：colorimetric method
单词：colorimetric method 相关文章
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我上个月坐火车到纽约去看朋友，上车后刚要坐下，旁边座位上的女乘客就开始很大声的自言自语，看上去精神好像不太正常，吓得我只好在过道对面远远地坐下。 后来我注意到，每次有人要
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Health Report - Does a Birth Control Method Raise HIV Risk? 健康报道 - 避孕药物是否真会增加艾滋病毒感染风险？ This is the VOA Special English Health Report. 这里是美国之音慢速英语健康报道。 The World Health Orga
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A: Are you a good driver? B: Yes, I'm rather good at driving. A: I need you to teach me how to drive. B: Yes, but do you have your learner's permit? A: Yes, I have it. B: Have you ever driven a car before? A: I drove a car before, but only once. B: A
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