不要用那些用化学方式处理过的水或“蓝水”。
Do not use water that has been chemically treated or "blue" water.
应当注意回收和回用化学品。
Attention should be given to recovery and reuse of chemicals.
配制并供应生产用化学品。
阐述了用化学蚀剂法加工非圆齿轮的方法。
Setting forth a method of utilizing chemicals to process non-circular gear.
以聚硅酸铝为混凝剂，用化学法絮凝处理餐饮废水。
Treatment of restaurant wastewater with polysilicate aluminium was studied.
你可以同样用化学方法来逆反这种“暗淡反应”，让银器们变回亮丽！
You can use chemistry to reverse the tarnishing reaction, and make the silver shiny again!
以聚硅酸铝为混凝剂 ，用化学絮凝法处理小区生活污水。
It is studied to treat domestic sewage with polysilicate aluminium.
用大量干净的水冲洗掉眼睛接触的化学物。
Flush out any chemicals the eye has been exposed to with plenty of clean water.
用有毒的化学药品做实验的时候你要格外小心。
Be careful when you do the experiment with the toxic chemical.
结果用普通的化学原料和简单的工艺设备，做出了有较好PTC性能的样品。
Withchemicals of ordinary quality and simple technical equipment, samples of good PTC property were obtained.
结果用普通的化学原料和简单的工艺设备，做出了有较好PTC性能的样品。
Withchemicals of ordinary quality and simple technical equipment, samples of good PTC property were obtained.
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