And dirty steel belt surface, impurity and Pb phase accumulation during alloy belt manufacture lead to worse adhesion between alloy layer and steel back.
Some children go through a phase of constantly slipping out of the child seat harness or seat belt, or releasing the buckle, during journeys.
有些孩子经过不断滑出的儿童座椅安全带或安全带，或释放扣，在旅途的一个阶段。
3
By simulation, draw the phase trajectory diagram and time response plans under different conditions, found out the acquisition belt relate to any initial phase error.