—I'm 1.42 metres.
—Oh! ________ I'm 1.38 metres.
A:I'm taller than you.
B:You're taller than me.
C:I'm stronger than you.
除去下列不纯物质中的少量杂质(括号内为杂质),请填入适当的试剂
(1)Cu(Al)____ (2)Fe2O3(Al2O3) ____
(3)NO(NO2) ____ (4)NaCl溶液(Na2CO3) ____.