答案:15s
A. A、LLC→LC→C1~C6
B. B、C1~C6→LC→LLC
C. C、LC→C1~C6→LLC
A. (A)红色
B. (B)黄色
C. (C)绿色
A. (A)闪点
B. (B)残值
C. (C)粘度