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【单选题】
渐开线齿廓在分度圆上的压力角为标准压力角,其大小为( )度。A.
10
B.
20
C.
40
D.
60
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A.
B.
C.
D.
D
【单选题】NEWS REPORT 3 1 What did the African university leaders meet to discuss? A . Economic development problems. B . Problems higher education is facing. C . Problems such as war, famine and poverty. D . E...
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B.
C.
D.
D
【单选题】已知25℃时电对MnO4-+8H++5e-=Mn2++4H2O的Eθ=+1．51 V，若此时H+浓度由1mol.dm-3。变为1×10-4 mol.dm-3，则该电对的电极电势变化值(V)为 ( )
A.
上升0．38
B.
下降0．38
C.
上升0．24
D.
下降0．24
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C.
D.
D
【单选题】News report 3 1. What does a recent stu dy find about older people?
A.
Their mental skills decrease as they get older
B.
Their mental skills can be improved through training
C.
Their physical and mental health improves through training
D.
Their mental skills will remain stable during training
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