下列哪项不是淋巴水肿的常见原因
A．淋巴管增生，扩大B．感染C．肿瘤压迫D．淋巴清扫术E．放射
参考答案：A
---The girl is said to have ___ gift for teaching deaf children.
---She is something. I think it calls for ____ patience and imagination.
A．a, the
B．a, /
C．the, the
D．/, a
由于大生产中所使用的好气性发酵罐是受压容器，因此封头选用（）封头。
A.锥形
B.椭圆
C.蝶形
D.球形
