litmus red test paper 红色石蕊试纸
red litmus paper 红色石蕊纸 ; 红石蕊试纸 ; 红色石蕊试纸
Litmus test paper red 红石蕊试纸
Red litmus extract powder rod 粉杆红石蕊提取物
litmus paper red 石蕊红
litmus paper red test paper 红色石蕊试纸
red d litmus paper 红石蕊试纸
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。
Litmus paper turns red in the presence of an acid.
石蕊试纸遇到酸就变红。
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。
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