问题
单项选择题
When using the term limber system one is referring to a（）.
A.Cleaning system
B.Drainage system
C.Strengthening system
D.Weight reduction system
答案
参考答案：B
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When using the term limber system one is referring to a（）.
A.Cleaning system
B.Drainage system
C.Strengthening system
D.Weight reduction system
参考答案：B