肛门直肠静脉以齿状线为界分为两个静脉丛：（）（）
参考答案：痔内静脉丛；痔外静脉丛
30平方米比24平方米多______%；140千克比______千克多40%；5千克减少20%后是______千克；5千克减少______%后是3千克．
There aren’t enough chairs. Would you please ______ ones here?[ ]
A. to bring another three
B. bring more three
C. to take three other
D. bring three more
