单词：rubidium maser
铷微波激射
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Lesson Nineteen 听力部分 Dictation: Please prepare your paper and pen. There are really __________ for _____ wine ______-_______________ a good corkscrew, ____, _______________, __________ the ____ of _______. The ______________ that most America
发表于:2019-01-14 / 阅读(170) / 评论(0)
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China has launched two satellites into space on a Long March carrier rocket from the Xichang Satellite Launch Center in Sichuan Province. The satellites are part of the country's growing BeiDou Navigation Satellite System. The launch of the Long Marc
发表于:2019-01-19 / 阅读(169) / 评论(0)
2018CRI中国国际广播电台
2018CRI中国国际广播电台