single-grain structure 中文意思是什麼
single-grain structure
解釋
單粒構造-
Gravel layer is a usual complex instable formation in drilling engineering. there are some basic features such as looseness of structure, increment, unequal sized grain. it is commonly to form discrete single - grained structure
在三個計算式的基礎上採用visualbasic編制了潛孔錘同心跟管鉆進風量、風壓計算及空壓機選型程序。
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