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GB/T 18688-2023_Chinese: Agricultural irrigation equipment - Pressure losses in irrigation valves - Test method (Chinese: 农业灌溉设备 灌溉阀的压力损失 试验方法) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 18688-2023
