在10keV一100MeV能量范围,光子与物质相互作用的三种主要形式中,电子对效应占

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问题:

在10keV一100MeV能量范围,光子与物质相互作用的三种主要形式中,电子对效应占优势的区域是()。

A.高能量区间及高原子序数

B.高能量区间及低原子序数

C.中能量区间及高原子序数

D.中能量区间及低原子序数

E.低能量区间及高原子序数

考点:LA医师(放射治疗X刀伽马刀)LA医师放射治疗上岗证考试LA医师放射治疗上岗证考试题库
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认知

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关于直肠的说法中,何者不对()。

A.直肠因其垂直而得名

B.女性直肠的前方有子宫及 * *

C.其末端开口于肛门

D.在盆膈以上的膨大部分称直肠壶腹

E.于第三骶椎处接乙状结肠

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在接地线引进建筑物的入口处,应设标志。明敷的接地线表面应涂15~100mm宽度相等的专用颜色的条纹来表示。正确的是()。

A.黄色条纹

B.黄色和红色相间的条纹

C.红色和绿色相间的条纹

D.绿色和黄色相间的条纹

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 Most children with healthy appetites are ready to eat almost anything that is offered to them and a child’ s rarely dislikes food unless it is badly cooked. The (21) a meal is cooked and served is most important and an attractively served meal will often improve a child’ s appetite. Never ask a child (22) he likes or dislikes a food and never discuss likes and dislikes in front of him or allow (23) else to do so. If the father says he hates fat meat or the mother (24) vegetables in the child’ s hearing he is likely to copy this procedure. Take it (25) granted that he likes everything and he probably will. Nothing healthful should be omitted from the meal because of a supposed dislike. At meal times it is a good (26) to give a child a small portion and let him come back for a second helping rather than give him as (27) as he is likely to all at once. Do not talk too much to the child during meal times, but let him get On with his food; and do not (28) him to leave the table immediately after a meal or he will (29) learn to swallow his food so he can hurry back to his toys. Under (30) circumstances must a child be coaxed(哄骗) or forced to eat.

26()

A.procedure

B.process

C.way

D.method

题型:单项选择题

股份有限公司设董事会,其成员为()人。

A、3—7人

B、5—13人

C、7—13人

D、5—19人

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