sight tube meaning in English
观察管
观察孔
砚管
Examples
- Install sight tube in test cock 3
在测试旋塞3号上安装观察管。 - Install sight tube in test cock 4 and fill with water as before
在测试旋塞4号安装观察管，并如前所述注水。 - When using ez - tc , close no . 1 and 2 shutoffs and install sight tube using adaptor fitting
在采用ez - tc时，关闭1号和2号关闭阀，采用适配器连接件安装观察管。 - The elliptical secondary should appear round and well centered in the circular opening of the sight tube
椭圆形的副镜应看上去边缘是圆的，在光管开口处呈现环状。 - Holding in vertical position , fill sight tube with water ( no water leakage can be permitted at sight tube joints )
将其垂直握住，将水注入观察管内（观察管连接处不能有泄漏） 。