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Download Requirements: Free Download2. Mathematical period: For a function f (x), if there is a non-zero constant T, so that when x takes every value in the domain, there is f (x + T) = f (x), then the function f (x) is called a periodic function. The nonzero constant T is called the period of this function.1. The word "ship" means all kinds of water craft and rafts used or capable of being used as water transport, including non-drainage craft and rafts, WIG craft and seaplanes.女记者欧阳兰和未婚夫坂野正南结婚在即，突然接到任务，帮助归国华侨寻找六十年前在太行山参加八路的女战士思源。当年在太行山参加过战争的随军老记者穆易告诉欧阳兰，思源很像当年在太行山做随军记者时见过的一个叫培蕊的女兵。于是，一段围绕着培蕊和跟她有关的故事在欧阳兰的追踪下，一点点清晰起来：培蕊和李营长之间的爱情、铜家峡惨案、花儿、黑妹子……无数个感人至深的故事让欧阳兰的内心不断翻腾。然而，一只“绣袜”却让欧阳兰震惊的发现，坂野正男的父亲正是当年制造铜家峡惨案的“杀人挺进队”的成员。正当欧阳兰陷入痛苦的矛盾中时，坂野正男却带着父亲的嘱托来到太行山，以实际行动表达了他们对当年的愧疚和对中国的友谊。但是要影响整个战局发挥决定xìng的作用怕是有些不大容易。　　小莲见子游痛不欲生，心下不忍，竟毅然飞身进入牡丹体内，拉着子游逃了出来。