简单地区别挥发油和脂肪油的性质是（）
A.溶解性
B.挥发性
C.稳定性
D.旋光性
E.折光性
参考答案：B
煤长期储存会发生哪些变化？
The watch and chain as well as the ring of gold.
A．are made
B．were made
C．is made
D．was made
