Some friends tried to settle the quarrel between Mr.and Mrs.Smith without hurting the feeling of______,but failed.

A．none

B．either

C．all

D．another

计算及判断有无碰撞危险，采取避碰措施时用对水真运动。在标绘、用于ARPA系统中输入接口的主要用途是使各传感器模拟信号匹配。