具有两个磺酰胺基团，临床上常与其他抗高血压药合用的药物是（）
A．氢氯噻嗪
B．氯噻酮
C．乙酰唑胺
D．螺内酯
E．阿米洛利
参考答案：A
Of the 300 passengers ____ the plane, 245 were killed and 55 were seriously injured. [ ]
A. abroad
B. aboard
C. board
D. broad
什么叫状态估计？运行状态估计必须具备什么基础条件？
