铁塔、桅杆的爬梯应设置防止（）措施，并在明显位置悬挂或涂刷通信标志以及“（）、（）”的警示牌。
参考答案：攀爬；通信设备；禁止攀爬
He asked us to _____ him ____ carrying through their plan. [ ]
A. assist; with
B. help; to
C. assist; in
D. help; with
矿井通风和矿井反风的具体要求有哪些？
