Asherman综合征是指()
A.染色体异常导致闭经
B.垂体功能低下导致闭经
C.闭经泌乳综合征
D.产后大出血引起
E.宫腔粘连引起
参考答案:E
The number of people present at the concert was______than expected . There were many tickets left .
A.much smaller
B.much more
C.much larger
D.many more
单级压缩制冷系统运行工况图可以用()表示