地板上铺的是草席,只有起居间铺了一块薄薄的破地毯.The floors were covered with matting and the hall laid with a thin rag carpet.他们当时正坐在二楼的起居间里等着吃晚饭.They were in the sitting room on the second floor, waiting for supper.指因居间及代理业务或受委?等所应负担之成本.Costs...
When the galvanometer reads zero the circuit is in the null - balance position.当检流计的读数为零时,电路处于零平衡位置.If a sinusoidal current is sent through a movingcoil galvanometer, the meter reads zero.如果将一正弦电流通入动圈式电流计, 那么这电流计的读数为零.Th...