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【简答题】

Questions 下列各are based on the following passage. To get a sense of how women have progressed in science, take a quick tour of the physics department at the University of California, Berkeley. This is a storied place, the 36 of some of the most important discoveries in modern science--starting with Ernest Lawrences invention of the cyclotron (回旋加速器.in1931. A generation ago, female faces were 37 and, even today, visitors walking through the first floor of LeConte Hall will see a full corridor of exhibits 38 the many distinguished physicists who made history here, 39 all of them white males. But climb up to the third floor and youll see a 40 display. There, among the photos of current faculty members and students, are portraits of the 41 head of the department, Marjorie Shapiro, and four other women whose research 42 everything from the mechanics of the universe to the smallest particles of matter. A sixth woman was hired just two weeks ago. Although theyre still only about 10 percent of the physics faculty, women are clearly a presence here. And the real 43 may be in the smaller photos to the right: graduate and undergraduate students, about 20 percent of them female. Every year Berkeley sends its fresh female physics PhDs to the countrys top universities. That makes Shapiro optimistic, but also 44 'I believe things are getting better,' she says, 'but theyre not getting better as 45 as I would like. A.circumstance B.confidence C.covers D.current E.deals F.different G.exposing H.fast I.honoring J.hope K.presently L.rare M.realistic N.site O.virtually 第36题应填____ 第37题应填____ 第38题应填____ 第39题应填____ 第40题应填____ 第41题应填____ 第42题应填____ 第43题应填____ 第44题应填____ 第45题应填____

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【单选题】加速器的等中心是指()

A.
机架的旋转中心与束流中心一致
B.
机架的旋转中心与小机头旋转中心一致
C.
机架的旋转中心与治疗床的旋转中心相一致
D.
机架的旋转中心、束流中心与治疗床旋转中心一致
E.
机架的旋转中心、小机头旋转中心、治疗床旋转中心与束流中心相一致

【单选题】医用加速器中采用X线均整器的目的是()

A.
滤去X线中的低能部分
B.
改善X线的能谱分布
C.
扩大有用照射野的范围
D.
增大X线的穿透能力
E.
减低X线的输出剂量

【单选题】医用加速器中采用X线均整器的目的是()

A.
滤去X线中的低能部分
B.
改善X线的能谱分布
C.
扩大有用照射野的范围
D.
增大X线的穿透能力
E.
减低X线的输出剂量