题目内容
下列哪项不是偶然误差的特性( )。
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下列误差中( )属于系统误差。
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.”
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