肺动脉瓣体表投影（）
A.胸骨右缘第2肋间
B.颈8～胸5脊髓后角
C.胸骨左缘第2肋间
D.胸骨左缘第5肋间
E.胸骨左缘第3肋间
参考答案：C
何为法律制裁，有几种？
________ with his work in the Satellite Launch Site，he could not spare any time to stay with his parents though they are very old.
A．As occupying
B．Occupied
C．Having occupied
D．To occupy
