问题
单项选择题
As compared to carbon dioxide,dry chemical has which advantage?（）.
A.Cleaner
B.Effective
C.Greater range
D.More cooling effect
答案
参考答案：C
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As compared to carbon dioxide,dry chemical has which advantage?（）.
A.Cleaner
B.Effective
C.Greater range
D.More cooling effect
参考答案：C