Based on the theory derivation and analysis of practice surveying data, the best surveying distance method and the best surveying distance according to the chosen distance gages are determined. Accord
<正>The high performance magnesium alloy was investigated by adding B2O3 in magnesium and magnesium alloys. Experiments include adding B2O3 in Mg, Mg-Al and Mg-
Heredity of microstructure in AlTiC master alloy, grain refiners, was analyzed. It is found that, for morphologies and distributions of TiC particles, there are