如图所示两根等长的轻绳将日光灯悬挂在天花板上两绳与竖直方�的夹角都为日光灯保持水平所受重力为g左右两绳的拉力大小分别为a.g和gb Template




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tomski如图所示两根等长的轻绳将日光灯悬挂在天花板上两绳与竖直方�的夹角都为日光灯保持水平所受重力为g左右两绳的拉力大小分别为a.g和gb coloring