Is making fire a physical property or a chemical property? How do you know? 生火是物理性质还是化学性质？你怎么知道？
How many nanometers are in 70 millimeters? 7毫米等于多少纳米？
Which of these are chemical properties:
以下哪些是化学性质：
Steel can be separated into iron and carbon, true or false 钢可以分为铁和碳, 正确或错误