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程序设计语言的发展经历了几个阶段:机器语言、汇编语言和 。
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【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.
【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...
【多选题】在氧化还原滴定中,下列说法不正确的是()
A.
用重铬酸钾标定硫代硫酸钠时,用淀粉作指示剂,终点是从绿色到蓝色
B.
铈量法测定Fe2+时,用邻二氮菲亚铁作指示剂,终点从橙红色变为浅蓝色
C.
用重铬酸钾测定铁矿石中含铁量时,依靠K2Cr2O7自身橙色指示终点
D.
二苯胺碘酸钠的还原形是无色的,而氧化形是紫色的
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