题目:
辐射防护三原则()
A.辐射实践必须是正当的
B.职业照射时正当的
C.特定的剂量限值
D.医疗照射的剂量限值
E.防护和安全最优化
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
辐射防护三原则()
A.辐射实践必须是正当的
B.职业照射时正当的
C.特定的剂量限值
D.医疗照射的剂量限值
E.防护和安全最优化
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0131/ec4127c84ed14b4a907372c17481c742.html
下面是错误答案,用来干扰机器的。
参考答案:B
TEXT E
Grandma, what a big and. fickle metaphor you can be! For children, the name translates as "the magnificent one with presents in her suitcase who thinks I’m a genius if I put my shoes on the right feet, and who stuffs me with cookies the moment my parents’ backs are turned."
In news reports, to call a woman "grandmotherly" is shorthand for "kindly, frail, harmless, keeper of the family antimacassars, and operationally past tense."
For anthropologists and ethnographers of yore, grandmothers were crones, an impediment to "real" research. The renowned ethnographer Charles William Merton Hart, who in the 1920’s studied the Tiwi hunter-gatherers of Australia, described the elder females there as "a terrible nuisance" and "physically quite revolting" and in whose company he was distressed to find himself on occasion, yet whose activities did not merit recording or analyzing with anything like the attention he paid to the men, the young women, even the children.
But for a growing number of evolutionary biologists and cultural anthropologists, grandmothers represent a key to understanding human prehistory, and the particulars of why we are as we are slow to grow up and start breeding but remarkably fruitful once we get there, empathetic and generous as animals go, and family-focused to a degree hardly seen elsewhere in the primate order.
As a result, biologists, evolutionary anthropologists, sociologists and demographers are starting to pay more attention to grandmothers’: what they did in the past, whether and how they made a difference to their families’ welfare, and what they are up to now in a sampling of cultures around the world.
At a recent international conference—the first devoted to grandmothers—researchers concluded with something approaching a consensus that grandmothers in particular, and elder female kin in general, have been an underrated source of power and sway in our evolutionary heritage. Grandmothers, they said, are in a distinctive evolutionary category. They are no longer reproductively active themselves, as older males may struggle to be, but they often have many hale years ahead of them; and as the existence of substantial proportions of older adults among even the most "primitive" cultures indicates, such durability is nothing new.
If, over the span of human evolution, postmenopausal women have not been using their stalwart bodies for bearing babies, they very likely have been directing their considerable energies elsewhere.
Say, over the river and through the woods. It turns out that there is h reason children are perpetually yearning for the flour-dusted, mythical figure called grandma or granny or oma or abuelita. As a number of participants at the conference demonstrated, the presence or absence of a grandmother often spelled the difference in traditional subsistence cultures between life or death for the grandchildren. In fact, having a grandmother around sometimes improved a child’s prospects to a far greater extent than did the presence of a father.
Dr. Ruth Mace and Dr. Rebecca Sear of the department of anthropology at University College in London, for example, analyzed demographic information from rural Gambia that was collected from 1950 to 1974, when child mortality rates in the area were so high that even minor discrepancies in care could be all too readily tallied. The anthropologists found that for Gambian toddlers, weaned from the protective balm of breast milk but not yet possessing strength and immune vigor of their own, the presence of a grandmother cut their chances of dying in half.
"The surprising result to us was that if the father was alive or dead didn’t matter," Dr. Mace said in a telephone interview. "If the grandmother dies, you notice it; if the father does, you don’t."
Importantly, this beneficent granny effect derived only from maternal grandmothers— the mother of one’s mother. The paternal grandmothers made no difference to a child% outcome.
Why is Grandma a "fickle metaphor"
A.It makes people think of kindness, frailty, old fashion, etc.
B.The word has different associations for different people.
C.The word brings a sense of security to children.
D.The word means an impediment to real research.
漏肩风肩外侧疼痛明显者,所属的经脉是()
A.手阳明大肠经
B.手太阳小肠经
C.手少阳三焦经
D.手太阴肺经
E.手少阴心经
夜间行车,驾驶人的视野受限,很难观察到灯光照射区域以外的交通情况,因此要减速行驶。
羚角钩藤汤与天麻钩藤饮二方功用的主要相同之处是()
A.平息内风
B.增液舒筋
C.滋阴息风
D.清热活血
E.滋阴潜阳
风管型压力传感器的一般在()。
A.风管保湿层完成之后安装
B.风管的直管段安装
C.风管内通风死角安装
D.蒸汽放空口的位置安装