B. We should have larger police forces, tougher laws, and bigger prisons C. The report on the sniper attacks in the Washington, D.C. area is too dramatic D. The media has done too much to keep our children safe from harm 查看完整题目与答案 某公司使用指数平滑法来预测需求,...
根据《高处作业分级》 （GB/T3608— 93）,不同抛物高度（h）的可能坠落范围半径应符合下述要求：当h为2〜5m时，R为3m当h为＞ 5〜15m时，R为4m；当h为〉15〜30m时，R为5m；当h为〉30m时, 只为（ ）m（R）正确的是（ ）。