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Linux默认的系统管理账号是（）

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U4R2 PD:They must rush to get things done, and must follow their schedules to be productive.他们必须赶紧把事情做完，并且必须遵循日程安排，做尽量多的事。There's no need for people to feel so pressured.人们不必为此感到有压力。"(没有必要让人们觉得很有压力), so a company should not always ask its staff to follow its schedule, otherwise the company (必须遵循他们的时间计划以便更高效)". Jack said.

U4R2 PF: Individual needs are considered primary. 个体的需求被放在首位。......The individual sacrifices his or her needs to those of the group. 集体需求的满足可以个人需求为代价。Each is in the constant pursuit of benefits, although , (个人需求被认为是首要需求, he or she . (有时为了团体可牺牲他或她的利益) .

1. Liu Gang:He is very careful and likes to work with numbers.( )2. Lisa: She likes to travel, meet people and make new friends.( )3. Sue: She wants to work in an office, organising files, doing reception and answering calls.( )

质点系对任意一点的动量矩对时间的导数等于作用于该质点系的所有外力对同一点的矩的矢量和。

A. 对
B. 错