调水阀盖上的刻度盖标有刻度，配合标准杆，就可以知道每次调水阀盖所调的位置。
As a scale cover on the water regulating valve cover is marked with scales, by matching with a standard rod, the regulated position of the water regulating valve cover at each time can be known.
调水阀盖上的刻度盖标有刻度，配合标准杆，就可以知道每次调水阀盖所调的位置。
As a scale cover on the water regulating valve cover is marked with scales, by matching with a standard rod, the regulated position of the water regulating valve cover at each time can be known.
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