题目内容
运输综合成本是指决定提供某种特定的运输、配送服务所发生的费用。
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位于染色体着丝粒区的染色质是（）
Being unhappy is like an infectious disease. It causes people to shrink away from the sufferer. He soon finds himself alone and miserable. There is, however, a cure so simple as to seem, at first glance, ridiculous: if you don’t feel happy, pretend to be! It works. Before long you will find that instead of pushing people away, you attract them. You discover how deeply rewarding it is to be the center of wider and wider circles of good will.Then the make-believe becomes a reality. Being happy, once it is realized as a duty and established as a habit, opens doors into unimaginable gardens filled with grateful friends.
为了避免网卡间的地址冲突，每块网卡都必须给定一个全球惟一的地址，称为网卡的物理地址(或称MAC地址)。以太网卡的MAC地址是一个 【20】 位的二进制数。
它的功能是进行呼吸，在细胞中产生高能化合物的细胞结构是（）
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