对同一射线来讲,屏蔽物质的密度越大,一般对射线的阻挡作用也就越大。

题型:判断题

问题:

对同一射线来讲,屏蔽物质的密度越大,一般对射线的阻挡作用也就越大。

考点:大学试题第四章辐射防护及监测第四章辐射防护及监测题库
题型:判断题
     我们班将在周三有一个志愿者活动,同学们将做些什么呢?从表格中选取适当的词语完成句子,
使句意表达完整,符合逻辑。(有多余选项,请只填写字母)
A. clean   B. tiring   C. hold a concert   D. have a great time   E. clean up
F. in the library   G. much fun   H. put up   I. raise money   J. easygoing
K. drawing some pictures   L. fix up
     Volunteering is (1)______ and can really help other people.
     Our class is planning to do some volunteer work on Wednesday afternoon in the school. Students of
the Art Club are considering (2)______ and selling them to (3)______ for the poor. The music group is going
to (4)______ in school to entertain other students. Some students are going to help (5)______. They can help
to put books back onto the shelves. Several students want to do some repair work to help (6)______ stuff like
bikes, radios, etc. Some others will (7)______ the school garden. They think keeping the environment (8)______ is good for our health. Two boys, Michael and Jerry, are (9)______ and good at sports. They'd like to teach
younger students to play sports. Though it may be (10)______, everyone in class is looking forward to it.
题型:判断题

支票的提示付款期限自出票日起( )。

A.10日

B.15日

C.30日

D.2个月

题型:判断题

(7分)下图各物质是中学化学中常见的物质,甲、乙均是离子化合物,且阴、阳离子个数比为1∶1。甲是发酵粉的主要成分,乙是一种常用的化肥。B、D常温常压下是气体。请回答下列问题:

(1)甲的俗名是____________________________。

(2) A、D物质的水溶液分别滴入酚酞试液后,溶液均显红色,说明溶液均显性,其原理是否相同?请用必要的文字加以解释并写出离子方程式:

__________________________________________________________。

(3)向饱和氯化钠溶液中通入气体D至饱和后,再通入足量的气体B可制得物质甲,写出该反应的化学方程式:__________________________________________。

题型:判断题

某山区工程,场地地面以下2 m深度内为岩性相同,风化程度一致的基岩,现场实测该岩体纵波速度值为2700 m/s,室内测试该层基岩岩块纵波速度值为4300 m/s,对现场采取的6块岩样进行室内饱和单轴抗压强度试验,得出饱和单轴抗压强度平均值13.6MPa,标准差5.59 MPa,据《建筑地基基础设计规范》(GB 50007—2002),2 m深度内的岩石地基承载力特征值的范围值最接近()

A.(A) 0.64~1.27 MPa

B.(B) 0.83~1.66 MPa

C.(C) 0.9~1.8 MPa

D.(D) 1.03~2.19 MPa

题型:判断题

董事会每年度至少召开一次会议,每次会议应当于会议召开10日前通知全体董事和监事。代表1/10以上表决权的股东、1/3以上董事或者监事会,可以提议召开董事会临时会议。()

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