更多“在PowerPoint中如何进入演示文稿的幻灯片母版编辑界面”相关的问题
仪表位号FE£2010中，字母“E”的含义是( )。
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关于黄土具有湿陷性的原因,下列说法中错误的是()。
A. 具有大量的大孔隙B. 粒间的连结因水分增加而易于削弱和破坏C. 碳酸盐含量较高D. 具活动晶格的黏粒含量较高
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关于线虫卵的描述，正确的是（）
A.大多数线虫卵有卵盖
B.卵壳分三层，外层能够抵抗机械压力
C.内容物为卵细胞
D.虫卵需入水才能发育
E.卵壳最内层为蛔苷层
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女，20岁。2天前受风后出现左侧面部麻木，额纹消失，眼裂变大，鼻唇沟变浅，口角下垂歪向左侧，舌淡，苔薄白。针刺面部穴位应采用（）
A.直刺深刺
B.多穴重刺
C.轻刺浅刺
D.提插泻法
E.电针强刺激
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糠醛( ) A．18 B．19 C．20 D．21
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一游标卡尺，测量精度为0.02mm，则（）读数正确。
\tA.80
\tB.80.02
\tC.80.03
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以下关于票据和结算凭证的基本要求说法正确的是( )
A. 出票日期必须使用中文大写 B. ￥107000.53大写金额可以写成人民币壹拾万元零柒仟伍角叁分或者人民币壹拾万零柒仟伍角叁分 C. ￥16409.00大写金额可以写成人民币壹万陆仟肆佰零玖元 D. ￥6007.14大写金额可以写成人民币陆仟零柒元壹角肆分整
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绳传动、带传动属于（）。
A.摩擦传动
B.啮合传动
C.流体传动
D.电气传动
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偏态分布资料宜用下列哪个指标描述其分布的集中趋势( )
A . 算术平均数B . 中位数C . 几何平均数D . 百分位数
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鱼粉、蚕蛹粉、菜籽粕等在饲料中添加添加过多会影响牛奶的品质。
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The human Y chromosome--the DNA chunk that makes a man a man--has lost so many genes over evolutionary time that some scientists have suspected it might disappear in 10 million years. But a new study says it’ll stick around. Researchers found no sign of gene loss over the past 6 million years, suggesting the chromosome is "doing a pretty good job of maintaining itself," said researcher David Page of the Whitehead Institute for Biomedical Research in Cambridge, Mass. That agrees with prior mathematical calculations that suggested the rate of gene loss would slow as the chromosome evolved, Page and study co-authors note in Thursday’s issue of the journal Nature. And, they say, it clashes with what Page called the "imminent demise" idea that says the Y chromosome is doomed to extinction. The Y appeared 300 million years ago and has since eroded into a dinky chromosome, because it lacks the mechanism other chromosomes have to get rid of damaged DNA. So mutations have disabled hundreds of its original genes, causing them to be shed as useless. The Y now contains only 27 genes or families of virtually identical genes. In 2003, Page reported that the modern-day Y has an unusual mechanism to fix about half of its genes and protect them from disappearing. But he said some scientists disagreed with his conclusion. The new paper focuses on a region of the Y chromosome where genes can’t be fixed that way. Researchers compared the human and chimpanzee versions of this region. Humans and chimps have been evolving separately for about 6 million years, so scientists reasoned that the comparisons would reveal genes that have become disabled in one species or the other during that time. They found five such genes on the chimp chromosome, but none on the human chromosome, an imbalance Page called surprising. "It looks like there has been little if any gene loss in our own species lineage in the last 6 million years," Page said. That contradicts the idea that the human Y chromosome has continued to lose genes so fast it’ll disappear in 10 million years, he said. "I think we can with confidence dismiss ... the ’imminent demise’ theory," Page said. Jennifer A. Marshall Graves of the Australian National University in Canberra, a gene researcher who argues for eventual extinction of the Y chromosome, called Page’s work "beautiful" but said it didn’t shake her conviction that the Y is doomed. The only real question is when, not if, the Y chromosome disappears, she said. "It could be a lot shorter than 10 million years, but it could be a lot longer," she said. The Y chromosome has already disappeared in some other animals, and "there’s no reason to expect it can’t happen to humans," she said. If it happened in people, some other chromosome would probably take over the sex-determining role of the Y, she said.
A．the extinction of Y chromosome is inevitable.B．Page’s research is more beautiful than hers.C．the "imminent demise" theory is nonsense.D．whether Y chromosome will disappear is uncertain.
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根据《中华人民共和国国家安全法》，国家加强国家安全新闻宣传和舆论引导，通过多种形式开展国家安全宣传教育活动，将国家安全教育纳入（）和（），增强全民国家安全意识。
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《关于印发加强生产设备采购程序控制的刚性规定的通知》规定，符合招标条件未招标的或因计划管理、采购过程中不认真履行职责造成物资积压，超过半年的，给予相关责任领导（）处分。
A、行政记过、记大过或降职
B、行政记大过、降职或撤职
C、行政记大过、降职或免职
D、行政降职、撤职或免职
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博士后是继学士、硕士、博士之后的一种学位。（）
博士后是继学士、硕士、博士之后的一种学位。（）
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