更多“安全阀起跳后，应立即将压力调至正常范围，然后（），联系对安全”相关的问题
小儿贫血诊断标准，错误的是（）
A . 新生儿血红蛋白值<145g/L
B . 6个月至6岁血红蛋白值<100g/L
C . 6～14岁血红蛋白值<120g/L
D . 1～4个月血红蛋白值<90g/L
E . 4～6个月血红蛋白值<100g/L
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对比度是一项很重要的光学性能参数，由研究得知，人对亮度变化的察觉最小可达（）。
A.1%
B.2%
C.3%
D.5%
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胃蛋白酶在下列哪种情况下才具有活性
A．pH 7以上
B．pH 4以上
C．pH 3以下
D．需要有乙醇激活
E．需要有胆汁激活
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离心泵发生汽蚀后，易造成吸人管阻力（）。
A . A.减小
B . B.不变
C . C.消失
D . D.增大
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第3篇IQ-geneIn the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those that cause retardation) that affect intelligence. So researchers led by Robert Plomin of London's Institute of Psychiatry decided to look for some. They figured that if you want to find a 'smart gene', you should look in smart kids. They therefore examined the DNA of students like those who are so bright that they take college entrance exams four years early--and still score at Princeton--caliber levels. The scientists found what they sought. 'We have,' says Plomin, 'the first specific gene ever associated with general intelligence.'Plomin's colleagues drew blood from two groups of 51 children each, all 6 to 15 years old and living in six counties around Cleveland. In one group, the average IQ is 103. All the children are white. Isolating the blood cells, the researchers then examined each child's chromosome 6 of the 37 landmarks on chromosome 6 that the researchers looked for, one jumped out: a form. of gene called IGF2R occurred in twice as many children in the high-IQ group as in the average group--32 percent versus 16 percent. The study, in the May issue of the journal Psychological Science, concludes that it is this form. of the IGF2R gene that contributes to intelligence. Some geneticists see major problems with the IQ-gene study. One is the possibility that Plomin's group fell for 'chopsticks fallacy'. Geneticists might think they've found a gene for chopsticks flexibility, but all they've really found is a gene more common in Asians than, say, Africans. Similarly, Plomin's IQ gene might simply be one that is more common in groups mat emphasize academic achievement. 'What is the gene that they've found reflects ethnicity?' asks geneticist Andrew Feinberg of Johns Hopkins University. 'That alone might explain the link to intelligence, since IQ tests are known for being culturally sensitive and affected by a child's environment. 'And Neil Risch of Standford University points out that if you look for 37 genes on a chromosome, as the researchers did, and find that one is more common in smarter kids, that might reflect pure chance rather than a causal link between the gene and intelligence. Warns Feinberg, 'I would take these findings with a whole box of salt.'In the beginning of paragraph one we are told that scientists can not agree______.A. how much of IQ comes from intelligenceB. how many children inherit genes from parentsC. how much of IQ comes from genesD. how many children learn by experience
A.'Plomin'sB.'InC.A.
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A . 银行存款B . 应收账款C . 库存现金D . 其他货币资金
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由各种生态因子综合而成的影响某种生物（包括人类）的个体、种群或某个群体的环境是（）
A.自然环境B.物质环境C.生态环境D.种群落
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安全生产责任制是生产经营单位最基本的安全制度。建立的安全生产责任制必须符合国家安全生产法律法规和( )的要求，并应适时修订。
A.方针 B.措施 C.政策 D.目标
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与传统采购相比，准时化采购的采购批量的特点是______
A．大批量高频率
B．大批量低频率
C．小批量低频率
D．小批量高频率
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联邦优思灵的有效期为（）。
A.12个月
B.24个月
C.36个月
D.48个月
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测量压力大于4MPa时，正常工作压力应为量程的()。
A.1/3~1/2
B.1/3~2/3
C.1/4~2/3
D.1/3~3/5
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