balance law平衡律balancen.平衡；天平；平静；结余；差额；调和；制衡vt.权衡；使平衡；抵消；称重量vi.均衡；建立平衡balanced-shaped casting平衡式浇道balance between two poles两极平衡balance ranked set sample平衡秩集样本balanced polyphase system平衡多相系balanceable attack angles平衡攻角balanced type carburettor平衡式汽化器balanced amino acids diet氨基酸平衡日粮balanced fuel composition平衡燃料成分balanced threewire system平衡三线制balanced incomplete block平衡不完全区组