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【单选题】
用铜片、银片、AgNO 3 溶液、导线构成一个原电池。以下有关该原电池的叙述正确的是：①在外电路中，电流由铜电极流向银电极②正极反应为：Ag + +e ― ＝Ag③实验过程中取出银片，原电池仍继续工作④将铜片浸入AgNO 3 溶液中发生的化学反应，与该原电池总反应相同A.
①②
B.
②④
C.
②③
D.
③④
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举一反三
【单选题】The mayor is a woman with great and therefore deserves our political and financial support.
A.
intention
B.
instinct
C.
integrity
D.
intensity
【单选题】Our society's confidence in its institutions of higher education is expressed through investments that wisely couple support for research with support for graduate education.
A.
Our society attaches greater importance to research than to graduate education.
B.
A large proportion of the antional budget goes to the development of education.
C.
Our investments in education combine support for research with support for graduage education.
D.
Our society's lack of confidence is its institutions of hegher education derives from generous investments made in education.
【简答题】Keen observation of the speaker can support our listening skills.
【简答题】有两个电容器,电容分别为10μF和20μF,它们的额定工作电压分别为25V和15V。现将它们并联后接在10V的直流电源上,则它们储存的电荷量分别是____和____;此时等效电容是____μF;并联电路允许加的最大工作电压是____。(用小数表示)
【单选题】In the sentence 'His ambition to become an astronaut deserves our support', the italicized part is used as
A.
an attributive
B.
an appositive
C.
a complement
D.
an adverbial
【单选题】They sent us their statement, ______ to get our support.
A.
hoped
B.
to hope
C.
hoping
D.
having hoped
【简答题】将上题中的两个电容器串联后接在30V的直流电源上,则它们储存的电荷量分别是____和____;(用小数表示)此时等效电容是____μF(用分数表示);该串联电路允许加的最大工作电压是____。(用小数表示)
【简答题】Our society’s confidence in its institutions of higher education is expressed through investments that wisely couple support for research with support for graduate education.A. Our society attaches gr...
【单选题】They sent us an open letter, ______ to win our support.
A.
hoped
B.
hoping
C.
hope
D.
to hope
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