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The pins on the PCB are dual-column or multi-column components and the layout direction of multiple discrete components regularly arranged should be as consistent as possible and toward the direction of the PCB under design in the production line, as shown in the following figure:民国初年，江南小镇青石街突遇狂风暴雨，雷电将保佑全镇祥和安宁的石碑 “江山永和”击碎。按照族规，新的碑刻必须由同年同月同日生的一对金童子篆刻，并在其中一人娶亲的良辰吉日立上桥头。 　　青石街人终于迎来了贺紫垣和周云亭这对金童子，两人都天生聪颖，长大后分别以文科和算学状元的优异成绩被高等师范学堂录取。临上学前，贺紫垣偶遇临村姑娘罗怡莲，一见钟情。 　　在学校，周云亭爱上新女性欧阳豆蔻。而豆蔻却喜欢贺紫垣。贺紫垣因保护豆蔻，遭到警察局长的儿子胡中汉暗算而被学校开除。 　　回到青石街，心中念着罗怡莲的贺紫垣谢绝了所有的提亲。罗怡莲却屈从父母之命嫁入周家。周云亭对包办婚姻坚决不从，没掀罗怡莲的红盖头就跳窗逃走了。愤怒的周父断了周云亭上学的银两。 　　周云亭的小姨娘香翠与柜头周季关系暧昧，他们一直想霸占周家财产。周父发现后气得大病，请贺紫垣去找周云亭回家。香翠和周季害死周父，嫁祸于罗怡莲。周云亭回家后迁怒于罗怡莲，并要与她离婚。但因族长的阻止，使看到了希望的贺紫垣和罗怡莲再次陷入痛苦之中。小小的青令狐心中钦仰，拔剑相助，和向问天联手，激斗正邪诸多高手。1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.最后，临走的时候，陈启如此说道。The profit of the second scourge injury is 15%/(1-20% +10% +25% +30% +15%) = 9.375% compared with only one scourge injury.Penalty Provisions