The results are shown that reliability level of the members are sufficient, the guaranteed reliability is higher using the calculating formulas of characteristic crack width of current design codes.
According to the characteristic of width covered scope and width specialties adaptation, and the problem in teaching, the teaching reform scheme is proposed in road surveying design course.
Practical application indicate, sow on the basis of MPEG-4 standard and IP multicast system of technology have in high compression rate, high network width utilization ratio, etc. characteristic.