最常见的发冷、发热的外科急腹症是
A．溃疡病穿孔
B．绞窄性肠梗阻
C．急性梗阻性化脓性胆管炎
D．急性化脓性阑尾炎
E．急性重症胰腺炎
参考答案：C
If the work , you can go and play games. [ ]
A. finished
B. has finished
C. will be finished
D. is finished
求代数式5x2﹣4xy+y2+6x+25的最小值．
