遗尿的常见原因有（）
A.受惊
B.疲劳
C.环境改变
D.隐性脊柱裂
E.大脑发育不全
参考答案：A, B, C, D, E
The army has _____ grain. They are in a very difficult situation.[ ]
A. run down
B. run out of
C. run off
D. run into
凸轮按形状可分为盘形凸轮、移动凸轮和______凸轮。
