Effects of re content on mechanical properties and abrasion resistance of high carbonic chromium cast steel were studied.
研究了稀土元素及其添加量对高碳铬铸钢力学性能和耐磨性的影响。
Disadvantages: technical requirements of high production, more than 72 hours of water erosion is easy to produce carbonic acid crystals.
缺点：生产技术要求高，水侵蚀超过72小时易产生碳酸结晶。
The activity of carbonic anhydrase in the soils of low vegetation coverage is lower than that in the soils of high vegetation coverage in various Karst ecosystems.
对于不同岩溶生态系统，植被覆盖率低的土壤碳酸酐酶活性低于植被种类丰富的土壤碳酸酐酶活性。
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