单选题（） the bodies are, （） the friction will be.AThe smoother；the greaterBSmoother；lessCThe rougher；the greaterDrougher；greater
单选题
（） the bodies are, （） the friction will be.
A
The smoother；the greater
B
Smoother；less
C
The rougher；the greater
D
rougher；greater
参考解析
解析：
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