In order to form a shielded water area and keep out the wave in Dongying Port extension engineering, precast reinforced concrete wave boards were adopted in the rear platform.
东营港扩建工程为形成掩护水域和挡浪，后方承台采用预制钢筋混凝土挡浪板遮帘。
So, if ultrasonic wave is used to determine SIF, only the first one passing through the front (or rear) surface of the specimen can be used.
要用超声波确定应力强度因子，只能采用透出试件前(或后)表面的第一个纵波信号。
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