Some preliminaryworks were done in measuring cosmic neutron current. The results show that cosmic neutron currents change regularly in different meteorological conditions.
初步进行了宇宙中子流的测量，结果表明：在不同的气象条件下，宇宙中子流呈现有规律的变化。
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This article tries to make a preliminary exploration about thoughts and art of their works from an angle of literary narration with a combinative method of influencing research and parallel research.
According to introduction, China has set up preliminary target to sell average 100 planes each year, China will strengthen the works on export of ARJ21, Xinzhou-60, Y-12 series and H425 helicopter.