肺源性心脏病主要表现是（）
A.左心房右心室增大
B.右心室肥大
C.右心房增大
D.右心房左心室增大
E.左心室增大
参考答案：B
根据句意完成句子。
1. Smoke from those big factories is __________ (harm) to the villagers nearby.
2. When the fire happened, the firemen hurried there and carried the children to ________ (safe).
3. It is well _________ (know) that the Beijing Olympics in 2008 was a great success.
4. His fans rushed towards him _________ (short) after the match.
5. To keep a lamp _________ (burn), we have to keep putting oil in it.
怎样在铣床上加工带有弯曲面的工件？
