镇痛作用强度、持续时间与吗啡相当，耐受性、成瘾性产生较慢，戒断症状轻的药物是（） ["吲哚美辛","纳洛酮","哌替啶","喷他佐辛","美沙酮"]
腹部损伤患者，出现呕血，黑粪和腹部绞痛时，应考虑（） ["十二指肠破裂","胰腺损伤伴胰腺炎","外伤性胆道出血","胆囊破裂","应激性溃疡"]
特征性的颈内动脉系统TIA症状是（） ["眼动脉交叉瘫","跌倒发作","短暂性全面性遗忘症","双眼视力障碍发作","平衡失调伴耳鸣"]
数控机床如何分类？
给水压力应（）锅炉工作压力。 ["等于","大于","小于","等于2.5倍"]
陶瓷碳纤维式
