简述生物防护措施概念？
参考答案：
指树草等植物直接或配合使用对水利工程的边坡、基脚所起到的防护作用。
Recently I bought an ancient Chinese vase (花瓶), _____ was very reasonable. [ ]
A. which price
B. the price of which
C. its price
D. the price of whose
喉新生物患者可有（）。
A.咳嗽伴呼气性哮鸣音
B.咳嗽伴吸气性喘鸣
C.持续性阵咳，晨起及平卧位时加重
D.发病较急的刺激性干咳
E.突发剧烈阵咳
