喷灌系统有几类？
参考答案：
按各组成部分安装情况及可移动程度，喷灌系统可分固定式、移动式和半固定式三种类型。
Our keys to the gate were ____ to our neighbours during our absence. [ ]
A. given out
B. given away
C. given over
D. given up
易风化的饮片是（）
A.没药
B.红花
C.白术
D.橘络
E.芒硝
