Around midday, the fog lifted and puffy cumulus clouds appeared across the sky.中午前后雾散了，满天出现了蓬松的积云。From his bed he could see the great cumulus clouds that hung in the blue sky.躺在床上,可以望见碧蓝的天空中飘浮着大块团状的积云.A polar landscape o...
Power electric circuits, magnetic circuits , lumped parameter electromechanics, elements of linear and rotating electric machinery.电力电路 、 磁路、电机机械的混合参数、线性元件与旋转电机....