放射性直肠炎表现为（） ["粘膜充血、水肿","散在浅表溃疡、渗血","两者均有","两者均无"]
只有（）运动的精子方可用来输精。 ["摆动","转圈","直线前进","原地游动","倒退"]
治疗滞产应首选（） ["A.合谷","B.太冲","C.足三里","D.血海","E.至阴"]
通过什么商业模式，促进我国重大装备和优势产能“走出去”？（） ["市场主导","外资主导","企业主导","政府推动"]
采用β受体阻滞药治疗心绞痛，下列哪项叙述正确（） ["宜用小剂量来治疗心绞痛","易产生耐药性，不宜长期应用","多数患者对本药的耐受性较强","与硝酸酯类药物有拮抗作用，需加大剂量","突然停药有诱发急性心肌梗死的可能"]
变压器不用铁芯行吗？
