瘀血停滞之胃痛，其治疗可选用 （）
A.丹参饮
B.芍药甘草汤
C.失笑散
D.逍遥散
E.调营饮肝饮
参考答案：A, C, E
This aircraft's safety record is an ________ testament to its designers' skill.[ ]
A．imaginative
B．sensitive
C．impressive
D．active
带电检测绝缘子前，对检测器有什么要求？
