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【多选题】
下列关于电容量的说法正确的是()A.
电容量的单位是C
B.
电容量是反映电容器储存电荷能力的一个物理量，它在数值上等于电容器在单位电压作用下所储存的电荷量
C.
它只与电容器的极板正对面积、极板间距离以及极板间电介质的特性有关；而与外加电压的大小，电容器带电多少等外部条件无关。
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【单选题】数据物理独立性是指( )。
A.
概念模式改变，外模式和应用程序不变
B.
概念模式改变，内模式不变
C.
内模式改变，概念模式不变
D.
内模式改变，外模式和应用程序不变
【单选题】数据物理独立性是指 ( )
A.
数据库与数据库管理系统相互独立
B.
用户程序与数据库管理系统相互独立
C.
用户的应用程序与存储在磁盘上数据库中的数据是相互独立的
D.
应用程序与数据库中数据的逻辑结构是相互独立的
【单选题】The writer of a detective story makes use of ________ to involve the readers to find out what’s concealed beneath.
A.
plot
B.
a detective
C.
dialogue
D.
police
【单选题】数据库系统的数据物理独立性是指( )。
A.
概念模式改变，外模式和应用程序不变
B.
概念模式改变，内模式不变
C.
内模式改变，概念模式不变
D.
内模式改变，外模式和应用程序不变
【判断题】The writer deliberately makes Polly Espy use a lot of exclamatory words like: “Gee, Oo, wow-dow” and clipped vulgar forms like: “delish, marvy, sensaysh, terrif, magnif etc.” to create the impression ...
A.
正确
B.
错误
【单选题】The writer makes use of all the following arguments except _________.
A.
Japanese-style conversations are like bowling
B.
Western-style conversations are like tennis or volleyball
C.
in Japanese-style conversations, you must wait your turn to speak
D.
Western-style conversations are longer than Japanese-style conversations
【单选题】According to the writer, the use of the calculator in class ____________.
A.
is something we can all agree on
B.
leads to difficulty with understanding algebra
C.
helps develop the skills needed for understanding math
D.
makes students spend far too much time
【多选题】What makes it possible for the writer to produce such vivid and immediate description?
A.
Contact with and awareness of different types of people
B.
His thorough and profound understanding of 'human nature”
C.
His keen power of observation and active imagination
D.
His effective use of language
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