移动梯应配备有效的()措施,应有明显的载荷标识。
A.防撞
B.防水
C.防滑
D.防散
参考答案:A, C, D
If it _____ rain tomorrow, I _____ swimming with my friends. [ ]
A. isn't, can going
B. will be, will go
C. doesn't, will go