there are two kinds of traditional self-healing ring , one is unidirection ring and the other is bi-direction ring. both structures of ring are of some shortages for resource configuration.
传统的自愈环可分为单向环和双向环,这两种结构在资源配置时都有一定的不足之处。
in the traditional chinese teacher evaluation system exist the problems of simplicity in content, utility in objective, unity in standard and unidirection in power.
国内传统教师评价体系存在着评价内容简单化、评价目标功利化、评价标準统一化、评价动力单向化等问题。
the structure of cement steel wire net thin shell arch, unidirection suspension invese「l」type is a new style.
a kind of degradable and absorbable composite for bone fracture fixation with high strength and module is presented, which is made of unidirection cpp/plla fiber composite.