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【单选题】
给出下列命题A.
一直线与一个平面内的无数条直线垂直，则此直线与平面垂直；
B.
两条异面直线不能同时垂直于一个平面；
C.
直线倾斜角的取值范围是： ；
D.
两异面直线所成的角的取值范围是： ． 其中正确的是 （写出所有正确的序号）．
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皮皮学刷刷变学霸
举一反三
【简答题】Ames 试验中 TA98 、 TA97 检测 突变; TA100 检测 突变; TA102 对醛、过氧化物及 DNA 交联剂较敏感。
【简答题】A．The function of brain. B．The function of nerve cells. C．The five senses. D．The chemical processes.
【单选题】Which of the following best characterizes the function of the second paragraph of the passage?
A.
It develops a topic introduced in the first paragraph.
B.
It provides evidence to refute a claim presented in the first paragraph.
C.
It gives examples of a phenomenon mentioned in the first paragraph.
D.
It presents a generalization about examples given in the first paragraph.
【单选题】Which of the following best describes the function of the third paragraph of the passage?
A.
It offers evidence that contradicts the theory outlined in the previous paragraph.
B.
It presents a specific example of the application of the theory discussed in the previous paragraphs.
C.
It explains data that the researchers mentioned in the first two paragraphs have yet to successfully analyze.
D.
It qualifies the statistical evidence described in the previous paragraph.
E.
It begins a detailed description of the theory roughly outlined in the previous two paragraphs.
【单选题】Which of the following best describes the function of the third paragraph of the passage?
A.
It presents a specific example of the process discussed in the first two paragraphs.
B.
It explains a problem that the researchers mentioned in the second paragraph has yet to solve.
C.
It evaluates the research discoveries described in the previous paragraph.
D.
It begins a detailed description of the process introduced in the previous two paragraphs.
【简答题】背景： 一般来说，承包商是指由企业雇佣来完成某些工作或提供服务的单位或个人，如设备保运维护、物资供应、建筑施工、劳务派遣等承包商。长期以来，某企业要求其各承包商自行做好进入现场前的安全培训，效果很差，承包商出现的安全事故占企业安全事故总数的90%以上。鉴于此，该企业在2014年提出所有承包商在进入企业生产现场前一律参加由该企业统一组织的安全培训。培训内容涉及安全法律法规和政策、风险识别、直接作业现...
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