下列哪类业务“经办报文修改”提供了报文删除功能？（）
A.TN业务
B.CO业务
C.TW业务
D.TP业务
参考答案：D
The engineers made two big plans for the dam, ____ was never put in force.
A．one of them
B．which
C．one of which
D．every one of which
“寒极生热，热极生寒”说明了阴阳之间的哪种关系？（）
A.相互转化
B.相互交感
C.对立制约
D.互根互用
E.消长平衡
