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【单选题】
在化学反应aA+bB = cC+dD中，下列说法正确的是
A.
化学计量数a与b之和一定等于c与d之和
B.
反应物A和B的质量比一定等于生成物C和D的质量比
C.
若取zgA和zgB反应，生成C和D的质量总和不一定是2zg
D.
若A和C都是盐，则该反应一定是复分解反应
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参考答案：
D
复制纠错
举一反三
As to most people, what’s the purpose for learning a foreign language？
A.
To travel to that country.
B.
To work better.
C.
To do business.
What do the posters say？
A.
They can teach people to speak English better.
B.
They can teach people to speak a foreign language within a short time.
C.
They can teach people to speak a foreign language about everything.
The cakes are delicious. He’d like to have ______ third one because ______ second one is rather too small.
A.
a; a
B.
不填; the
C.
a; the
D.
the; a
相关题目：
As to most people, what’s the purpose for learning a foreign language？
A.
To travel to that country.
B.
To work better.
C.
To do business.
What do the posters say？
A.
They can teach people to speak English better.
B.
They can teach people to speak a foreign language within a short time.
C.
They can teach people to speak a foreign language about everything.
The cakes are delicious. He’d like to have ______ third one because ______ second one is rather too small.
A.
a; a
B.
不填; the
C.
a; the
D.
the; a
参考解析：
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