Crack propagation conducts alternatively between the weld zone and the partially molten zone, and is not strictly to rupture at W/F boundary surface.
裂纹扩展在焊缝区和半熔化区之间交替进行，并非严格按W／F界面破断。
Therefore, it is suggested that plant tissue culture and rapid propagation techniques for L. sessiliflora, F. alba-coccinea, P. tithymaloides be successfully established.
建立了菊藻、白萼吊钟海棠和蜈蚣珊瑚的组织培养与快速繁殖技术体系。
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