【单选题】已知 25 °C 时 , E ɵ (Fe 3+ ,Fe 2+ )=0.77V, E ɵ (Sn 4+ ,Sn 2+ )=0.15V 。今有一电池 , 其电池反应为 2Fe 3+ +Sn 2+ = 2Fe 2+ + Sn 4+ , 则该电池的标准电动势 E ɵ 为 :
【多选题】以下关于血液的粘稠度(粘滞性)说法正确的是
A.
是指血管内运行的液体内部的各种物质分子或颗粒间的摩擦阻力导致的
D.
血液的粘稠度主要与血浆中的无机离子及糖等晶体物质的含量相关。
【多选题】以下关于气体粘度说法正确的有:
C.
在高压范围内,气体粘度表现出类似于液体粘度的性质
【简答题】已知 25 °C 时, E (Fe 3+ | Fe 2+ ) = 0.77 V , E (Sn 4+ | Sn 2+ ) = 0.15 V 。今有一电池,其电池反应为 2Fe 3+ + Sn 2+ === Sn 4+ + 2Fe 2+ ,则该电池的电动势 E (298 K) 为:
【单选题】听力原文:M:How 's your work going? W:I think this time I am really onto something. Q: What does the woman say about her work? (15)
A.
She's still looking for a topic.
D.
It's taking all her time.
【单选题】I am really a bit worried because I have no idea what my parents’ will be to my poor examination result.
【单选题】根据叉车安全操作规定,货叉载货下降时,发动机应()
【单选题】已知25°C时,E(Fe3+,Fe2+)=0.77V, E(Sn4+,Sn2+)=0.15V。今有一电池,其电池反应为 2Fe3+(a) + Sn2+(a) = 2Fe2+(a) + Sn4+(a),则该电池的标准电动势 (298.15K)为