
کانسار عبارت از ذخایر مواد معدنی موجود در زمین است که ارزش اقتصادی داشته باشد. عملیاتی که به شناسایی و …
In choosing materials of construction, we have to compromise between various factors. Use the acronym SHAMROCK to summarize and remember some of them. S = Safety: what are the consequences of failure? If they are serious, a more resistant material …