单词：self-expanding piston ring
单词：self-expanding piston ring 相关文章
Ocean Floor Reveals Past Climate Changes Time capsule Lamont research professor Maureen Raymo, the director of the Core Repository, slides open a long, narrow drawer from the cabinet. Like thousands of others here, the drawer contains a long, thin cy
VOA标准英语2012年(一月)
This Internal Combustion Engine is 50% More Efficient 新型内燃机效率提高50% Internal combustion engines in cars may be on their way out, but experts agree it will take a few decades before electric-powered vehicles become dominant. Meanwhile
VOA标准英语2016年(三月)
By Al Pessin Pentagon 13 July 2007 U.S. Defense Secretary Robert Gates says the al-Qaida terrorist network is expanding in North Africa, through a loose network of groups that share its ideology. VOA's Al Pessin reports from the Pentagon. Robert Gate
2007年VOA标准英语（七月）
A group of senior students from Zhejiang University have successfully developed an air hand-washing device. 浙江大学的一队大四学生成功研制出了空气洗手装置。 The device utilizes an infrared ray induction system, which detects t
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