单词：Knudsen effusion method
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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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A Step Closer to Major HIV Prevention Method A U.S. government panel has recommended the use of a once daily pill to help prevent HIV infection. The pill has been shown to be very effective in studies. The Food and Drug Administration, the FDA, now h
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SAF New Fire-Building Method Reduces Air Pollution With their megaphones and orange uniforms, these fieldworkers do not go unnoticed. This is Fine Town, a township south of Johannesburg. Every day, the fieldworkers walk around the townships to show t
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Traditional Teaching Method Do your teachers still use traditional techniques to teach you nowadays? A revol- ution in teaching techniques is required now. In the past, we just took it for granted that a teacher' s aim was to teach the students all t
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