在氧化还原反应CuO+H2Cu+H2O中,氧化剂是( )
A.CuO
B.H2
C.Cu
D.H2O
答案:A
氧化铜中的铜的化合价由+2价降低到0价,得电子,是氧化剂,选A。
一个数的30%是150,这个数是______.
Uncle Wang gave all his savings to the Hope School _______ he himself was not rich.[ ]
A. because
B. as if
C. though
D. or