3. It's around 1,500 kfrom Beijing to Tianjin. 4. They had a qmeal and then went to school in a hurry. 5. She is iin hospital. Let’s go to see her after school. 6.The ebird catches the worm. 7.There is no mof getting there. ...
Device for telephone set to prevent it is of busy due to earphone not in right position一种不会因听筒未放好而导致长时间占线的电话机装置,包括:电话线接口电路;振铃检测器;混合电路;双音多频产生器;控制器,可控制电话线接口电路,执行自动断线功能;键盘;开关;忙音检测器,用以检测忙音,且当忙音持续超过一...