【单选题】NEWS REPORT 3 1 What’s the news report mainly about? A . Changes in romantic relationships. B . Development of the Internet. C . Changes in the ways of dating. D . Development in smartphones .
【单选题】Listen to understand News report 3 1
【单选题】已知:MnO4-(aq)+8H+(aq) +5e-↔Mn2++4H2O(l) 已知:EӨ(MnO4-/Mn2+)=1.51V,pH=2,其它离子浓度均为1mol/Kg。此时E的数值在下列哪个范围内?
【单选题】News Report 3 1
A.
Remind people to care their personal appearance.
B.
Pay compliments to the person in front of it.
C.
Tell the person in front it what to dress.
D.
Make the company more competitive.
【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...
【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 ( )
【单选题】某零件调质处理后硬度偏低, 补救的方法是:
【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
【单选题】已知 E θ ( MnO 4 — /Mn 2+ ) =1.51V , E θ ( Fe 3+ /Fe 2+ ) =0.77V , 则反应 MnO 4 — +5Fe 2+ +8H + =Mn 2+ +Fe 3+ +4H 2 O 的平衡常数为 ( )