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问题 单项选择题

下面关于吸烟和肿瘤的关系错误的是（）。

A.吸烟是肺癌的公认病因

B.吸烟仅仅与肺癌有关，与其他肿瘤无关

C.吸烟者患肺癌的比例低于20％

D.吸烟与口腔癌有关

E.在发达国家，由于宣传戒烟，肺癌的发生率已不再增高

答案

参考答案：B

解析：吸烟不但可以导致肺癌，而且和口腔癌、下咽癌、食管癌、胃癌、膀胱癌等相关。

单项选择题

In your project, you establish clear expectations regarding acceptable behavior by project team members e. g. managing conflicts, resolving issues, timely attendance in all meetings etc. You believe that early commitment to clear guidelines will decrease misunderstanding and increase productivity. These expectations and guidelines can also be referred to as ______ .

A．team-building activities

B．ground rules

C．general management skills

D．rules of conduct
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问答题 简答题

利用网管对通信网络和设备进行周期性巡视的一般要求是什么？
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