Vacuum tube encryption arrangement looks easy, it is very difficult, the main problem is a linertube hole connection is too narrow after the processing difficulty, easy deformation.
真空管加密排列看起来容易,做起来是很难的,主要问题一是内胆管孔连接处过窄后加工难度大,极易变形。
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An experiment on hydrothermal growth are in process in a sealed tube with a precious metal liner.