下列海域中属于我国内海的是（ ）
A．黄海
B．南海
C．东海
D．渤海
我国的内海有两个：渤海和琼州海峡．
故选：D．
If a country wants to develop its economy successfully, there has to be a clear () of its social needs.
A. appreciation
B. assurance
C. assumption
D. assessment
试述保留灌肠时常使用的压力、深度及禁忌证？
