Fe3+</sup>和Fe2+</sup>与CN-</sup>络合反应的稳定常数分别为42和35,在铁盐溶液中加入氰化钠溶液,将使Fe3+</sup>/Fe2+</sup>电对电势()。
A.升高
B.不变
C.降低
D.电势变化与CN-无关
A.升高
B.不变
C.降低
D.电势变化与CN-无关
第1题
A.稀硫酸
B.盐酸
C.NH4F
D.邻二氮菲
第2题
第3题
极点A的坐标为20<sup>。</sup>N,50<sup>。</sup>E,把它绕投影图的法线顺时针转动70<sup>。</sup>;从N向S看,以逆时针方向绕N-S轴转动80<sup>。</sup>;绕坐标为20<sup>。</sup>S,40<sup>。</sup>W的极点顺时针转动60<sup>。</sup>。在上列每一种情况求出极点A转动后的位置,并画出转动路线的轨迹。
第6题
第9题
Which of the following did the author probably suggest?
[A] Support not the most supported.
[B] Deny everything others believe.
[C] Throw all tradition into trashcan.
[D] Keep your eyes open all the time.
第10题
The case of Schutt helmet demonstrated that ______.
A.some injury claims were no longer supported by law
B.helmets were net designed to prevent injuries
C.product labels would eventually be discarded
D.some sports games might lose popularity with athletes