单项选择题
A.7度和8度Ⅰ、Ⅱ类场地,高度大于80m,8度Ⅲ、Ⅳ类场地和9度,高度大于60m B.7度和8度Ⅰ、Ⅱ类场地,高度大于100m,8度Ⅲ、Ⅳ类场地和9度,高度大于60m C.7度和8度Ⅰ、Ⅱ类场地,高度大于100m,8度Ⅲ、Ⅳ类场地和9度,高度大于80m D.7度和8度Ⅰ、Ⅱ类场地,高度大于100m,8度Ⅲ、Ⅳ类场地,高度大于80m,9度,高度大于60m
A.0.4702 B.0.4772 C.0.4807 D.0.4824
A.A B.B C.C D.D