肛柱
参考答案：
直肠下端由于与口径较小且呈闭缩状态的肛管相接，直肠粘膜呈现8～10个隆起的纵形皱襞，称为肛柱。
民兵干部一年内训练时间为（）
A、15天
B、20天
C、25天
D、30天
According to the new classical model, a reduction in current taxes that is financed by government borrowing will most likely increase:（）
A. household saving but not real interest rates.
B. real interest but not household saving.
C. both household saving and real interest rates.
