心内膜炎可描述为是由（）。
A.链球菌引起的心脏瓣膜疾病
B.痘病毒感染心内膜
C.白假丝酵母引起的心内膜疾病
D.孕妇传染的TORCH组疾病
参考答案：A
----- John looks a bit upset. Did you tell him the bad news?
------Yes, but I _____him after his birthday party.
A．should have told
B．must have told
C．shouldn’t have told
D．needn’t have told
提高回转烘干机产量的途径有哪些？
