1psi=()PA ["A、6.9×10
3","B、6.9","C、0.07","D、10.2×10
3"]
1mmH20=()PA ["A、1.4×10
-3","B、1×10
-4","C、9.8×10
-3","D、9.8"]
1mmH20=()KPA ["A、1.4×10
-3","B、1×10
-4","C、9.8×10
-3","D、9.8"]
1mmH20=()BAr ["A、14.22","B、9.8×10","C、0.98","D、9.8×10
-5"]
1kgf/Cm2=()BAr ["A、14.22","B、9.8×10","C、0.98","D、9.8×10
-5"]
计算题:如图13-16(a)所示为35kV线路直线杆塔头部布置图,现已知上横担自重为157N,安装情况下垂直力∑G
1为11445N,横担采用A3钢,[σ]=157MPa,试选择上横担的吊杆直径。