围堰按与水流方向的相对位臵，可以分为（）和（）.
参考答案：横向围堰；纵向围堰
24. Because there was a conflict of interests among the leaders, two members ______ from the board of MVP in protest against its disharmony last week.
A．ranged
B．refreshed
C．resigned
D．Rejected
生殖器结核最常见的部位是（）
A.子宫内膜
B.子宫浆膜
C.卵巢
D.输卵管
E.子宫颈
