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问题 选择题

下列描述中，错误的是  [ ]

A.电解熔融的氧化铝制取金属铝，用铁作阳极

B.电解法精炼粗铜，用纯铜作阴极

C.钢铁吸氧腐蚀的正极反应：O2 +2H2O+4e-==4OH-

D.在镀件上电镀锌，用锌作阳极

答案

答案：A

选择题

Only when he left his hometown and went abroad_______ he loved his parents very much.

A．has he realized

B．did he realize

C．he realized

D．he had realized
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单项选择题

心脏杂音的强度与呼吸运动密切相关的是（）

A.主动脉瓣关闭不全

B.三尖瓣关闭不全

C.二尖瓣关闭不全

D.二尖瓣狭窄

E.主动脉瓣狭窄
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