骨盆底形态学特征正确的是
A.外层为盆膈
B.中层为泌尿生殖膈
C.肛门外括约肌属盆膈范畴
D.球海绵体肌有松弛 * * 作用
E.肛提肌是组成骨盆底外层的肌肉
参考答案:B
Hurry up! The play _____ for ten minutes. [ ]
A. has begun
B. is beginning
C. has been on
D. began
实际碳酸氢盐(AB)=标准碳酸氢盐(SB)<正常值表明为()
A.代偿性酸中毒
B.呼吸性酸中毒
C.代偿性碱中毒
D.呼吸性碱中毒
E.无酸碱平衡紊乱