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litmus red test paper 红色石蕊试纸
It will be wise to go over your test paper again. 还是把您的考卷再检查一遍的好。
He is answering the test paper busily. 他正忙着答考试卷。
Or, if you are unwilling to look at it closely, examine it with a piece of pH test paper (litmus paper). 在学术界及营养学上，一般将食品分成酸性食品和碱性食品两大类。
He erased pencil marks form the test paper and handed to the teacher. 他擦去试卷上的铅笔笔迹然后递给了老师。
congo red test paper 刚果红试纸,刚果试纸
It is the new material called carbonic acid(H2CO3,a kind of acid) that turns purple litmus red . 就是因为生成新物质碳酸(H2CO3一种酸)，碳酸使紫色石蕊试液变红。
It would be wise to go over your test paper again. 还是把您的考卷再检查一遍的好。
Phenol red test was used to observe its expectorant action in mice. 用小鼠酚红实验观察其祛痰作用。
The purple litmus solution turned red.It is the new material called carbonic acid(H2CO3,a kind of acid) that turns purple litmus red . 就是因为生成新物质碳酸(H2CO3一种酸)，碳酸使紫色石蕊试液变红。
No. I didn't find any mistake in his test paper. 没错。我在他的试卷上没发现任何错误。
No. I do not find any mistake in his test paper. 没错。我在他的试卷上没发现任何错误。
You'd better go through your test paper again. 你最好把考卷再看一遍。
Have you checked your test paper?--Yes, I have. 你检查了你的考卷吗？检查了。
Have you checked your test paper? --Yes,I have. 你检查了你的考卷吗?检查了。
He is answeringthe test paper busily. 他正忙着答考试卷。
He ruled the test paper carefully. 他小心地在考卷上画直线。
Please make five copies of the test paper. 请将这份试卷复制五份。
Have you checked your test paper? --Yes, I have. 你检查了你的考卷吗?检查了。
I want to use this student's test paper. 我想提调一下这位同学的期末考试试卷。