在同一个低压供电系统中,允许保护接地和保护接零同时使用。
参考答案:错
40 kilometers _____ Chengdu lies a town, _____ suffered great losses in the earthquake, but is now on the road to recovering.
A.west of; which
B.on the west in; where
C.west of; where
D.on the west of; which
雨篷板在雨篷梁的下口比上口好,是因为前者的墙身不容易渗水。