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};Non-metallized holes must indicate the aperture and quantity; The copper thickness of the metallized hole is ≥ 25 um.杰克和他的朋友查尔斯、阿贝等人痴迷于UFO，经常到森林“狩猎UFO”，遗憾的是他们并没有找到任何外星生物的痕迹，却意外收集了一些奇怪的粘质物，并将其带回了家。机缘巧合之下，杰克用粘质物创造出了一只恐龙，一只十分可爱的、充满好奇心、形似剑龙的变色恐龙，并取名 “马格纳斯”。为了避免马格纳斯人们被发现，杰克决心要把它藏起来，但是随着小恐龙的身体呈指数增长，杰克和他的小伙伴们再也无法向军方和岌岌可危的小镇隐瞒这个秘密………,尹旭笑道：也好，留下这么一个人让。The above design, as commented above, when executing the Resize method of SmartTest, if a rectangular object is passed in, when the height is greater than the width, the width will be automatically increased until it exceeds the height. However, if a square object is passed in, it will fall into a dead loop. The fundamental reason at this time is that rectangles cannot be the parent class of squares. Since there is a problem, they can be reconstructed so that both of them inherit from quadrilateral classes. The refactoring code looks like this: