微型机的DOS系统属于哪一类操作系统A.单用户操作系统 B.分时操作系统 C.批处理

题型:单项选择题

问题:

微型机的DOS系统属于哪一类操作系统

A.单用户操作系统

B.分时操作系统

C.批处理操作系统

D.实时操作系统

考点:计算机等级考试B笔试一级B笔试
题型:单项选择题

俯视图和左视图中相应投影高度相等。

题型:单项选择题

请结合图示实验装置,回答下列问题。

       

(1)图中a、b仪器的名称:a    ,b    

(2)用高锰酸钾固体制氧气,选用的发生装置是    (填“A”、“B”或“C”),装入药品前应先进行的操作是    ,反应的化学方程式是    

(3)某同学在实验室用C装置(多孔隔板用来放块状固体)制取CO2,反应的化学方程式为    , C装置与B装置相比较,优点为    (答出一点即)。

(4)实验室用B装置制取H2时,b中应加入    。如要获得干燥的气体,除发生装置外,还应选用盛放    (填写试剂名称)的D装置。如用E装置收集H2,则气体应从    端通入(填“c”或“d”)。

题型:单项选择题

某企业上年度销售收入为20000元,本年度销售收入为80000元。按照资金习性分析,每1元销售收入所需变动资金为0.30元。则该企业本年度新增的资金需要量为( )元。

A.6000

B.12000

C.18000

D.24000

题型:单项选择题

下列关于静态投资评价指标的有关讨论中,不正确的是( )。

A.投资收益率没有考虑投资收益的时间因素,指标的计算主观随意性太强

B.静态投资回收期是在不考虑资金时间价值的条件下,以项目的净收益回收其全部投资所需要的时间

C.资本周转速度愈快,回收期愈短,风险愈小,盈利愈多

D.根据偿债备付率的计算公式,偿债备付率必须按年计算

题型:单项选择题

Beijing: The United States and North Korea had their first ______ in four months here this afternoon as part of the ______ negotiations on how to end North Korea’s nuclear program, but diplomats played down prospects for______. James A. Kelly, assistant ______, and Kim Yong Ⅱ, North Korea’s deputy foreign minister, met ______ of formal discussions, ______ on direct dialogue that began after a stormy meeting ______ in which North Korea warned that it was moving quickly to ______ nuclear arms. The Bush administration had insisted ______ that it would only hold talks with North Korea ______ because, it argued, only ______ pressure would persuade North Korea to______. It got its way when North Korea dropped its insistence on ______ and agreed, after extensive efforts by China, to hold unusual simultaneous negotiations with ______,______,______ and ______ as well as the United States. Though Bush administration officials had not ______ talking privately with the North Koreans during______, the fact that Mr. Kelly and Mr. Kim met on the first day was seen as a sign of ______ by the American side.

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