aThe teacher goes into the classroom with a smile on his face.At the beginning,he makes a self-introduction.And he tells us that his English name is john.Then he asks all of us to think of English names for ourselvs. 老师在他的面孔进入教室以微笑。在开始,他做自已介绍。并且他告诉我们他...
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The UV Accelerated weathering test chamber (UV aging test chamber) stimulates dew and rain with consideration for humidity and/or water spray equipped with a fluorescent UV lamp which can completely simulate the UV spectra of sunlight, and exposes materials to altern...