将挥发油分级分馏时，在高沸点馏分中有时可见到蓝色、紫色或绿色馏分，这显示可能有薁类成分的存在。（）
参考答案：对
Li Ping was born_________ .
A．in the year 1984，at 10 a.m.on June 18th
B．on June 18th at 10 a.m.in the year 1984
C．at 10 a.m.in the year 1984 on June 18th
D．at 10 a.m.on June 18th in the year 1984
髓射线
