蛛网膜下腔阻滞的适应证（）
A.下腹部手术
B.肛门手术
C.会阴部手术
D.下肢手术
E.盆腔手术
参考答案：A, B, C, D, E
上皮的棘层或基底层出现个别或成群的细胞角化称为
A．过度角化
B．过度正角化
C．过度不全角化
D．错角化
E．棘层增生
________ more careful, his ship would not have sunk.
A．If the captain were
B．Had the captain been
C．Should the captain be
D．If the captain would have been
