窑巡检岗位的危险有害因素包括高温烫伤、触电、粉尘、噪音、氨水腐蚀、氨气中毒、高处坠落以及()。
A、机械伤害
B、物体打击
C、中暑
D、滑倒
参考答案:A, B, C, D
Our teacher entered the classroom, __________.[ ]
A. a book in hand
B. book in hand
C. book in his hand
D. a book in hands
挖方边坡妨碍视距,应按所需横净距开挖()
A、视距台
B、障碍