炎症时，引起血管通透性增加的机制是：内皮细胞收缩和／或穿胞作用增强，（）（）。
参考答案：内皮损伤；新生毛细血管壁高通透性
Jack described his father，who ________ a brave boy many years ago，as a strong－willed man.
A．would be
B．would have been
C．must be
D．must have been
我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
