逆向确定射野参数相对正向方式的优点为() A.不需要确定复杂的约束条件 B.计划质量

题型:单项选择题

问题:

逆向确定射野参数相对正向方式的优点为()

A.不需要确定复杂的约束条件

B.计划质量较高

C.对治疗计划系统的性能要求低

D.对物理师的经验要求更高

E.子野数目通常较少

考点:广西住院医师相关专业知识相关专业知识题库
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The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially (1) the Depression of the 1930’s, the United States experienced a (2) birth rate. Then with the prosperity (3) on by the Second World War and the economic boom that followed it, young people married and (4) households earlier and began to (5) larger families than had their (6) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (7) economics was probably the most important (8) , it is not the only explanation for the baby boom. The increased value placed (9) the idea of the family also helps to (10) this rise in birth rates. The baby boomers began streaming (11) the first grade by the mid-1940’s and became a (12) by 1950. The public school system suddenly found itself (13) The wartime economy meant that few new schools were buih between 1940 and 1945. (14) , large numbers of teachers left their profession during that period for better-paying jobs elsewhere.

(15) , in the 1950’s, the baby boom hit an antiquated and inadequate school system. Consequently, the custodial rhetoric of the 1930’s no longer made (16) ; keeping youths ages sixteen and older out of the labor market by keeping them in school could no longer be a high (17) for an institution unable to find space and staff to teach younger children. With the baby boom, the focus of educators (18) turned toward the lower grades and back to basic academic skills and (19) . The system no longer had much (20) in offering nontraditional, new, and extra services to older youths.

13().

A. overtaxed

B. overdosed

C. overweighed

D. overlapped

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某操作系统有A类资源10个,B类资源12个,系统有3个用户甲、乙、丙,资源需求总量分别为:(A类资源)甲5、乙4、丙4;(B类资源)甲4、乙5、丙6。规定用户取得资源只能逐个进行,取得全部所需的资源(包括A、B两类资源)后才将其资源全部释放。当前系统资源的分配情况为:(A类资源)甲4、乙3、丙2;(B类资源)甲2、乙2、丙5。系统目前处于()。

A.安全状态

B.临界状态

C.不安全状态

D.死锁状态

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体循环的途径:左心室→______→全身各部及内脏毛细血管→上、下腔静脉→右心房.

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党员的先进性,党员与一般群众的根本区别,就在于党员具有高度的()。

A.组织纪律性

B. * * 主义觉悟

C.历史使命感与责任感

D.全心全意为人民服务的品质

题型:单项选择题

在委托地税代收工会的过程中,工会应注意哪些问题?

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