蛇床子的功效是
A．攻毒杀虫，祛风止痛B．解毒杀虫止痒，补火助阳通便C．杀虫止痒，燥湿祛风，温肾助阳D．解毒，止痛，开窍醒神
参考答案：C
Knowledge and learning are important if we want to be successful,but they may
also ____ ourthinking. [ ]
A. direct
B. limit
C. change
D. improve
地下管线的埋深可分为（）
A.内底埋深
B.外底埋深
C.外顶埋深
D.内顶埋深
