hand-operated valves 中文意思是什麼
hand-operated valves
解釋
手動閥-
Hydraulically and hand - operated wedge gate valves - technical condition
液動手動楔式閘閥技術條件 -
Most are manually operated valves ( by hand ) or mechanically controlled ( pressure / vacuum or float level )
大部分為手動閥門或機械控制閥(壓力/真空或浮子度) 。
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