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If there are no special requirements, all printed boards in the company will adopt tin spraying process and hot air leveling. The thickness of tin spraying layer shall generally be ≥ 10 um;　Elizabeth Thatcher, a young school teacher from a wealthy Eastern family, migrates from the big city to teach school in a small coal mining town in the west.李维华是个严以律己、恪尽职守的官员，日子本来过得挺滋润，可就在她面临人大换届选举的时候，她的丈夫任涛却被牵涉进了一桩金融诈骗案，接着，她又发现了丈夫的"小蜜"秦小仪的存在，而且这个秦小仪还怀孕了！另一方面，检察官林栋受命调查任涛的金融案，却受到了某服装公司老板吴经纬的作梗，此前吴经纬曾因受贿罪被林栋查出而锒铛入狱，出狱后不择手段地报复林栋成了他人生的一件大事……皮皮加入蓝星星率领的新闻采访队，前往神秘的水晶洞窟探险，却意外发现了传说中古老的地底王国。大家正欲探个究竟，却被前来抢夺光之豆的嘎噜逼到死角，处境十分危险！这时，克鲁竟然没有选择和大家一起逃跑，而是转身独自向嘎噜宣战。为了救克鲁，皮皮冒险回到地底王国，没想到竟意外解除了魔咒，使受到诅咒的女王和王子恢复成原来的样子。可是，克鲁却愈来愈痛苦，因为他受到欲望豆的操纵，情绪经常失控。魔王欧帝发现克鲁比他的部属更能发挥邪恶的力量，于是打算好好利用他。没想到，情况失控了，黑暗地域的新魔王鲁克诞生了……所以西楚国人没必要太过苛待他们，不过也有人想要在他们身上撒撒气，可惜被人阻止了。In real life, China's income tax is divided into enterprise income tax, foreign-invested enterprises or foreign-invested enterprises income tax and personal income tax. For these three types of income tax, each is calculated in a different way. Personal income tax has a personal income tax calculation method, while enterprise income tax has its corresponding calculation method. If we do not adopt the policy mode to realize such a requirement, we will define an income tax class, which has an attribute to identify the type of income tax and a CalculateTax () method to calculate the tax. In this method, we need to judge the tax type and calculate the income tax for different tax types through if-else statements. Such an implementation can indeed solve this scenario, but such a design is not conducive to expansion. If the system needs to add an income tax in the later period, it has to go back and modify the CalculateTax method to add an additional judgment statement, which clearly violates the principle of "open-closed". At this time, we can consider using the strategic mode to solve this problem. Since the tax method is the changing part of this scenario, we can naturally think of abstracting the tax method at this time, which is also the essence of the implementation of the strategic mode.1. For all ships: