广义地说，一切体表浅显外科疾患总称为
A．溃疡
B．疮疡
C．肿疡
D．脓疡
E．痈疽
参考答案：B
Some passengers feel sorry that it usually _______ so long to buy tickets.
A．costs
B．takes
C．spends
D．spares
磨机有哪几种型式？常用的有哪几种？
