我国三级公路服务水平分级的主要指标主要是（）。
A.速度
B.密度
C.流量
D.延误率
参考答案：D
A．To isolate them completely.
B．To watch them carefully.
C．To treat them with respect.
D．To provide them with nutritious food.
郁金既能活血止痛，又能行气止痛，治疗气滞血瘀痛证，常配伍
A．木香B．香附C．檀香D．沉香E．青木香
