| 摘要 |
A liquid for evaporators to render the flows visible contains 20 to 85 parts of 1,2-dihydroxypropane, 0 to 20 parts of bis(2-hydroxyetheyl) ether, 5 to 15 parts of 1,3-butanediol and 5 to 25 parts of 1,2,3-trihydroxypropane in 5 to 50 parts of water.
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