题目内容：
水杨酸分光光度法测定水中铵时，酸度和碱度过高都会干扰显色化合物的形成。A．正确
B．错误
参考答案：
判断题：水杨酸分光光度法测定水中铵时，酸度和碱度过高都会干扰显色化合物的形成。A．正确B．错误
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A．正确
B．错误
A．正确
B．错误
彩陶成就最突出的是黄河流域的（）文化和马家窑文化。
彩陶成就最突出的是黄河流域的（）文化和马家窑文化。
Don't tell me what to do!
Don't tell me what to do!
Economists study the way a society uses scarce resources such as land, labor ...
Economists study the way a society uses scarce resources such as land, labor ...
Fred was such a hardworking student that he soon came out first in the class.
Fred was such a hardworking student that he soon came out first in the class.
Great writers are those who not only have great thoughts but also express the...
Great writers are those who not only have great thoughts but also express the...