Vacuum connection 14. Bucket with ice and water.
真空连接器14装有冰和水的桶子。
Vacuum tube encryption arrangement looks easy, it is very difficult, the main problem is a liner tube 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。
If a triaxial vacuum feedthrough is unavailable, a metal safety shield should be built around the isolated BNC connection (Figure 4-18).
如果无法找到三同轴的真空接头，那么可以在绝缘的BNC连接处构建金属安全屏蔽(图4 - 18)。
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