Combined with subsea tunnel engineering at eastern route way in Xiamen,the minimum rock covering thickness of subsea tunnel,water pressure design values,section optimization of lining structure and waterproof and drainage project,construction measures throughout bad subsea geology section,such as fault,solution groove,necessity of service tunnel setting were analyzed.

On the basis of an implementation of RFCOMM multiplex,this paper analyzes the implementation and utility property of the two kind (exclusive and shared) of emulated serial ports,pointing out that the shared mode not only saves the server channels for the server,but also enhances the success probability of the client s connection attempt.