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【单选题】
在氧化还原反应K 2 Cr 2 O 7 +14HCl=2CrCl 3 +2KCl+3Cl 2 ↑+8H 2 O中,被还原的物质是
A.
HCl
B.
2CrCl 3
C.
K 2 Cr 2 O 7
D.
Cl 2
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【简答题】阅读短文,完成练习 Last Monday, we went to a park by bike. We had a great day. We flew kites. Then Lily sang some songs. At twelve o'clock, we had lunch together. We had sandwiches and some milk. In the aftern...
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