什么是压花皮？
参考答案：
压花皮一般选用修面皮或开边珠皮来压制各种花纹或图案而成。
住宅楼多孔板用φP4消除应力钢丝，单根钢丝截面积Ay=12.6mm2，已知其抗拉强度标准值fptk=1770N/mm2，张拉程序为0→103%σcon，试计算确定单根钢丝的张拉力。
Alex, who has recently lost his two dogs, decides to stick a poster outside his offi ce describing the characteristics of the dogs and offering EUR5,000 as reward to anyone who returns the dogs to him. Beatrice, who has read the advertisement, fi nds and returns one of the lost dogs to Alex. Catherine, who has not read the advertisement, fi nds and returns the other lost dog to Alex.Required:Advise Alex as to his liability, if any, to Beatrice and Catherine. (10 marks)
