On-Contact Printing密贴式印刷
On The Contact Surface在接触面上
Report on Nearest Contact最近的信息
Theory on Implied Contact默示契约说
Actions on chance contact突发事件时保持联系
on delay contact延时动作接点
On Radio Contact开机
Review on the contact fiocculation接触絮凝研究进展
deformated on switch contact plate开关铜片变形