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下列误差中( )属于系统误差。
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对某段距离进行9次观测,观测值的中误差为 3mm,则该段距离的算术平均值的中误差为。
根据误差的性质和产生的原因,误差可分为___、___、____。
Translate the paragraph into Chinese.Couch surfing is travelling on a budget, using a broad network of contacts in order to get overnight accommodation for free, or at as little cost as possible. Participants join dedicated websites, providing as much information about themselves as possible in order to make others feel comfortable hosting them, or using them as a host. Various verification of names and addresses, personal references, and “vouching for”a particular member as a reliable host or gues. In addition to the financial advantages of couch surfing, participants also claim that the practice gives them a more unique, authentic travel experience, allowing them to experience culture and cuisine through the locals. “We open our minds and lives and welcome the knowledge that becomes available through cultural exchange.”said Casey Fenton, founder of Couchsurfing.com. “Couchsurfing wants to change not only the way we travel, but how we relate to the world.”
Translate the paragraph into English.丝绸之路（the Silk Road）是历史上链接中国和地中害的一条重要贸易路线。因为这条路上的丝绸贸易占绝大部分，一次被称为“丝绸之路”。这条古道冲长安开始，经过河西走廊（the Hexi Corridor）,到达巴基斯坦（Pakistan）、印度，甚至罗马。作为国际贸易的通道和文化交流的桥梁，丝绸之路促进了东西方经济文化的交流，并对中西方社会经济的发展乃至文明的进程都有着深远的影响。
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