25℃时下列叙述正确的是( ) A.浓度相同的①NaCl、②CH3COONa、③

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问题:

25℃时下列叙述正确的是(  )

A.浓度相同的①NaCl、②CH3COONa、③NaHCO3三份溶液的pH:③>②>①

B.0.1mol•L-1某二元弱酸强碱盐NaHA溶液中:c(Na+)=2c(A2-)+c(HA-)+c(H2A)

C.

图中b点时:c(Na+)>c(CH3COO-

D.

图中a点溶液中各离子浓度的关系是:c(Na+)>c(OH-)>c(CH3COO-)>c(H+

考点:粒子浓度大小的比较盐类水解判断溶液酸碱性或比较溶液pH值的大小沉淀溶解平衡酸碱中和滴定
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A study released a little over a week ago, which found that eldest children end up, on average, with slightly higher IQ’s than younger siblings, was a reminder that the fight for serlfdefinition starts much earlier than freshman year. Families, whatever the relative intelligence of their members, often treat the firstborn as if he or she were the most academic, and the younger siblings fill in other niches: the wild one, the flirt.
These imposed caricatures, in combination with the other labels that accumulate from the sandbox through adolescence, can seem over time like a miserable cat. entourage of identities that can be silenced only with hours of therapy. But there’s another way to see these alternate identities: as challenges that can sharpen psychological skills. In a country where reinvention is considered a birthright, many people seem to treat old identities the way Houdini treated padlocked boxes: something to wriggle free from, before being dragged down. And psychological research suggests that this ability can be a sign of mental resilience, of taking control of your own story rather than being trapped by it.
The late-night bull sessions in college or at backyard barbecues are at some level like out-of-body experiences, allowing a re-coloring of past experience to connect with new acquaintances. A more obvious outlet to expand identity--and one that’s available to those who have not or cannot escape the family and community where they’re known and labeled —is the Internet. Admittedly, a lot of the role-playing on the Internet can have a deviant quality. But researchers have found that many people who play life-simulation games, for example, set up the kind of families they would like to have had, even script alternate versions of their own role in the family or in a peer group.
Decades ago the psychologist Erik Erickson conceived of middle age as a stage of life defined by a tension between stagnation and generativity-a healthy sense of guiding and nourishing the next generation, of helping the community. Ina series of studies, the Northwestern psychologist Dan P. McAdams has found that adults in their 40s and 50s whose lives show this generous quality - who often volunteer, who have a sense of accomplishment - tell very similar stories about how they came to be who they are. Whether they grew up in rural poverty or with views of Central Park, they told their life stories as series of redemptive lessons. When they failed a grade, they found a wonderful tutor, and later made the honor roll; when fired from a good job, they were forced to start their own business.
This similarity in narrative constructions most likely reflects some agency, a willful reshaping and re-imagining of the past that informs the present. These are people who, whether pegged as nerds or rebels or plodders, have taken control of the stories that form their identities.
In conversation, people are often willing to hand out thumbnail descriptions of themselves: "I’m kind of a hermit." Or a talker, a practical joker, a striver, a snob, a morning person. But they are more likely to wince when someone else describes them so authoritatively.
Maybe that’s because they have come too far, shaken off enough old labels already. Like escape artists with a lifetime’s experience slipping through chains, they don’t want or need any additional work. Because while most people can leave their family niches, schoolyard nicknames and high school reputations behind, they don’t ever entirely forget them.

A recent study shows that

A.the firstborns and younger siblings are often treated differently.

B.higher IQ holders in a family are always the eldest.

C.the firstborns in a family often become more academic

D.the younger siblings are more likely to be ill-treated.

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根据小麦籽粒胚乳中淀粉和蛋白质含量的高低和结合的紧密程度,将胚乳分为()、()和()三种类型,其中()胚乳适合制作面包等食品,()胚乳适合制作饼干、糕点等食品。

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卫生部和国家工商行政管理总局对某国有企业共同作出一项行政处罚,该企业不服欲申请行政复议,应当如何处理( )

A.该企业应当向国务院申请行政复议,由国务院作出行政复议决定

B.该企业可以同时向两个机构申请行政复议,由国务院作出行政复议决定

C.该企业可以同时向这两个机构申请行政复议,由作出具体行政行为的国务院机构共同作出行政复议决定

D.该企业可以向其中任何一个机构申请行政复议,由作出具体行政行为的国务院机构共同作出行政复议决定

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是一种医药中间体.常用来制备抗凝血药,可通过下列路线合成。

(1)A与银氨溶液反应有银镜生成,则A的结构简式是______________。

(2)B→C的反应类型是____________。

(3)写出E和过量NaOH溶液共热时反应的化学方程式:____________________。

(4)下列关于G的说法正确的是___________。

A. 能与溴单质反应

B. 能与金属钠反应

C. 1 molG最多能和3mol氢气反应

D. 分子式是C9H6O3

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改革开放以来,我国经济发展步入了快车道,国内生产总值年均增长10%以上,人民生活水平不断提高,综合国力显著增强。取得这些成就的根本原因是[ ]

A.开辟了中国特色社会主义道路,形成了中国特色社会主义理论体系

B.坚持了中 * * 党的正确领导,坚持了党在初级阶段的基本路线

C.坚持科教兴国战略,坚持走可持续发展的道路

D.坚持改革开放,积极发展与世界各国的交流与合作

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