blue litmus paper 蓝石蕊试纸 ; 蓝色石蕊试纸
blue litmus paper Black 蓝石蕊试纸
blue litmus pper 蓝石蕊试纸
litmus blue test paper 蓝色石蕊试纸
Litmus Blue 蓝石蕊 ; 石蕊蓝
Litmus paper blue 蓝石蕊试纸
Turn the remnant of sodium hydroxide in the tube into water, and you'll find the solution turns red litmus blue.
把管内的氢氧化钠残液倒入水中，你就会发现：溶液会使红色石蕊试纸变蓝。
It was not quite the sudden shift from litmus red to blue of an acid being neutralised by an alkali, but it was not far off.
这种变化虽然不同于碱滴定酸时石蕊由红到蓝的突然转变，但也相差不远了。
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