更多“完全垄断厂商的边际收益曲线为()A. 一条平行于纵轴的垂直线”相关的问题
关于高处作业的安全规定，错误的是（）。
A.上下交叉作业时应设好防护 B.作业人员不得沿立杆或栏杆攀登 C.作业人员应定期进行体检 D.下方警戒区设置应符合现行国家标准《高处作业分级》的有关规定
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男性，50岁，糖尿病10年，咳嗽咳痰3周，高热4天，咳痰带少量血丝，有夜间盗汗。体温40℃：，肺部未闻及啰音，胸片示两上肺和右肺中野可见密度较淡浸润影，似有透光区。外周血WBC9．2×109／L，中性粒细胞67％，淋巴细胞33％。ESR：78mm／h。该患者的治疗原则是（）
A . A.早期、联合、适量、规律、疗程加倍
B . B.中期、联合、适量、规律、全程
C . C.早期、联合、适量、规律、全程
D . D.早期、单药、适量、规律、全程
E . E.早期、足量、联合、规律、全程
F . F.为防止药物对糖尿病患者的身体造成损害，不能规律用药
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Most musicians agree that the best violins were made in Cremona, Italy, about 200 years ago. These violins sound better than any others. They even sound (21) violins made today. Violin makers and scientists try to make (22) like the old Italian violins. (23) they aren’t the same, Musicians prefer the old ones. No one really knows (24) these old Italian violins are so special, (25) many people think they have an answer. Some people think it is the age of the violins. But not all old violins sound wonderful. Only the old violins from Cremona are (26) . Other people think that the (27) to those violins is the wood. The wood of the violin is very important. It must be from certain kinds of trees. It (28) too young or too old. Perhaps the violin makers of Cremona knew (29) special about wood for violins. But the kind of wood may not be (30) important. (31) may be more important to cut the wood in a special way. Wood for a violin must be cut very carefully. It was to be the right size and (32) The smallest difference will change the sound of the violin. Musicians (33) think that this was the secret of the Italians. (34) they understood more than we do about how to cut the wood. Size and shape may not be the answer (35) .Scientists measured these old violins very carefully. They can make new ones that are exactly the same size and shape. But the violins do not sound (36) the old ones. Some scientists think the secret may be the varnish. Varnish is what covers the wood of the violin. It makes the wood (37) shiny. No one knows (38) the Italian violin makers used in their varnish. So no one can make the same varnish today. There may never be other violins (39) the violins of Cremona. And there are not very many of the old violins (40) .
Most musicians agree that the best violins were made in Cremona, Italy, about 200 years ago. These violins sound better than any others. They even sound (21) violins made today. Violin makers and scientists try to make (22) like the old Italian violins. (23) they aren’t the same, Musicians prefer the old ones. No one really knows (24) these old Italian violins are so special, (25) many people think they have an answer.
Some people think it is the age of the violins. But not all old violins sound wonderful. Only the old violins from Cremona are (26) .
Other people think that the (27) to those violins is the wood. The wood of the violin is very important. It must be from certain kinds of trees. It (28) too young or too old. Perhaps the violin makers of Cremona knew (29) special about wood for violins.
But the kind of wood may not be (30) important. (31) may be more important to cut the wood in a special way. Wood for a violin must be cut very carefully. It was to be the right size and (32) The smallest difference will change the sound of the violin. Musicians (33) think that this was the secret of the Italians. (34) they understood more than we do about how to cut the wood.
Size and shape may not be the answer (35) .Scientists measured these old violins very carefully. They can make new ones that are exactly the same size and shape. But the violins do not sound (36) the old ones. Some scientists think the secret may be the varnish. Varnish is what covers the wood of the violin. It makes the wood (37) shiny. No one knows (38) the Italian violin makers used in their varnish. So no one can make the same varnish today. There may never be other violins (39) the violins of Cremona. And there are not very many of the old violins (40) .
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《国家突发环境事件应急预案》的编制依据是( ) A．《中华人民共和国环境保护法》 B．《中华人民共和国海洋环境保护法》 C．《中华人民共和国安全生产法》 D．《国家突发公共事件总体应急预案》
A.《中华人民共和国环境保护法》B.《中华人民共和国海洋环境保护法》C.《中华人民共和国安全生产法》
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数量的减少既能用分数表示，也能用倍数表示的。()
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以下属于创新思维的基本特征的是( )。
A. 敏捷性B. 深刻性C. 意外性D. 风险性E. 多向性
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料在外力（荷载）作用下，（）的能力，称为该材料的强度。
A.消除变形 B.抵抗地震 C.抵抗破坏 D.预防断裂
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Speaker A: Excuse me. I’d like to exchange this watch. I just bought it. but look at this. Speaker B: ().
A. Yes, I know your watch is new, but I like my old one better.
B. What seems to be the problem
C. Thank you for your kindness, but my watch still works.
D. Sorry. Why didn’t you examine it carefully before you bought it
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下图中所示的踝足矫形器属于（）。https://assets.asklib.com/images/image2/201805290909583562.jpg
A . 地面反射型踝足矫形器
B . 双侧支条式塑塑料踝足矫形器
C . 后侧支条式塑料踝足矫形器
D . 前侧支条式塑料踝足矫形器
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风燥伤肺型咳嗽可选：
A.沙参麦门冬汤
B.桑杏汤
C.杏苏散
D.清燥救肺汤
E.桑菊饮
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220kV送电线路工程用外抱杆外拉线分解组塔，见图D-36，已吊件重W=4000N，抱杆与地面的夹角θ =75°，拉线合力作用线与抱杆夹角α=45
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含有苦杏仁苷的生药有()。
A.桃仁
B.郁李仁
C.苦杏仁
D.酸枣仁
E.白芥子
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