秦皮中的七叶内酯属于香豆素类，能治疗痢疾。
参考答案：对
I was ill that day, otherwise I ____ the sports meet
A．would have taken part in
B．took part in
C．had taken part in
D．would take part in
空调水管道安装立管垂直度的检查方法有（）。
A.直尺
B.线锤
C.水平仪
D.拉线
E.千分尺
