Frost heave is an upward swelling of soil during cryogenic conditions in cold regions. It is caused by the accumulation of ice crystals in subgrade soil, which
<正>Japanese company kicks off regional retail operations in HK Japanese hosiery company,NAIGAI Co.,Ltd,on September 9 announced the opening of its first indepe
<正>In the 2011 National State Grain Administration director meeting held recently,the head of State Grain Administration pointed out that Chinese grain enterpr