A：铅蓄电池放电时铅电极发生还原反应
B：钢铁吸氧腐蚀的正极反应：O2 + 2e- + 2H2O = 4OH-
C：给铁钉镀铜可采用Cu2+的溶液作电镀液
D：生铁浸泡在食盐水中发生析氢腐蚀
He spent a lot of time on English. _______, he got the most points in the English test.
Five ____ (twelve) of the population in this factory are women.
已知△ABC为等边三角形，AB=2．设点P，Q满足 AP→=λAB→ ， AQ→=(1−λ)AC→ ，λ∈R．若 BQ→⋅CP→ =﹣ 32 ，则λ=（ ）
