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【单选题】
298K时,已知Ey(Fe3+|Fe2+)=0.77V,Ey(Sn4+|Sn2+)=0.15 V,当这两个电极组成自发电池时,Ey为( )。A.
1.39 V
B.
0.62 V
C.
0.92 V
D.
V(分)>V(理)≠E
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【简答题】如图中，O 1 、O 2 、O 3 分别是大、中、小三个圆的圆心．如果大圆的周长是25.12厘米，那么中圆的面积是______平方厘米，小圆的半径与大圆半径的比是______．
【单选题】People send roses and cards to the people they love.
A.
Mother's Day
B.
Valentine's Day
C.
Halloween's Day
【单选题】According to the article, communication problems arise when
A.
people send the wrong signals.
B.
individual miss nonverbal cues.
C.
culture clash.
D.
people use the same signal to mean differently.
【单选题】According to Charles, people send messages via facsimile because
A.
it is cheaper and faster than ordinary mail.
B.
it is faster and not much more expensive than mail.
C.
it can send things that could not be expressed by telex.
D.
the Royal Mail could not reach places abroad.
【简答题】用圆规画一个圆,如果圆规两脚之间的距离是7厘米,画出的这个圆的周长是( )厘米。这个圆的面积是( )平方厘米。
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