用读数保持电路记录压力变化，较直接读取刻度值更加准确，可靠。
More precise and reliable recording is achieved by reading-keeping circuit compared with the original gauge-reading.
本实用新型能对船舶的油位、水位进行快速、准确、连续地测量，并具有读数保持及多种报警功能。
The utility model can continuously measure the oil level and the water level of ship rapidly and accurately, and has the indication keeping function and various warning functions.
将阀门保持在这个位置，当安全阀出现可以看到的第一次排放的同时，观察仪表读数。
Hold the valve at this position and observe the reading at the moment the first discharge is noted from the relief valve.
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