下列急性腹痛中不需要手术的是（）
A.急性胃炎
B.急性轻型胰腺炎
C.腹型紫癜
D.腹主动脉瘤
E.急性肠系膜淋巴结炎
参考答案：A, B, C, E
---What can I do for you?
----- If you _____ see Mr. Smith, give him my regards.
A．will
B．would
C．shall
D．should
试简述煤粉炉燃烧的原理？
