The middle and low-end steel is oversupplying at home while the supply of high-end steel falls short of demand, which needs a great deal of import. 中低端钢材在国内供大于求,而高端钢材供不应求,需要大量进口。
Effect of irrigation and oversupplying of potassium on content of nutrients and yield and quality of flue-cured tobacco 灌水和过量施钾对烤烟养分含量及烟叶产量品质的影响