—Have they finished the work?
—Not _______.[ ]
A. just
B. yet
C. ever
D. already
答案:B
如何防止转化炉点火爆炸?
单侧上睑下垂见于()
A.动眼神经麻痹
B.先天性上睑下垂
C.重症肌无力
D.面神经麻痹
E.视神经萎缩