下列离子方程式书写正确的是( )
A:铝粉投入到NaOH溶液中:2Al+2OH-=2AlO+H2↑
B:AlCl3溶液中加入足量的氨水:Al3++3OH-=Al(OH)3↓
C:三氯化铁溶液中加入铁粉:Fe3++Fe=2Fe2+
D:FeCl2溶液跟Cl2反应:2Fe2++Cl2=2Fe3++2Cl-
The policeman often helps the old woman walk _____________ the bridge.
You'd better not ask him about the problem. He's new here and he knows ______ about it.
西汉时期,汉文帝和汉景帝继续推行的政策是( )