桨叶绕垂直铰转动，称桨叶（）.
A.摆振
B.挥舞
C.变距
参考答案：A
When I _______ the farm, the children had finished _______ the apple. [ ]
A. reached; picking
B. got; picking
C. came; picked
D. arrived in; to pick
改动卫生间、厨房间防水层的，应当按照防水标准制订施工方案，之后必须经过的一条程序是什么？
