减慢心率从而降低心肌氧耗量，缓解心绞痛的药物是（） ["硝酸异山梨醇酯","硝苯地平","胺碘酮","美托洛尔","硝酸甘油"]
膀胱湿热证与脾不统血证的共同临床表现有（） ["A.小便余沥不尽","B.月经淋漓不断","C.尿血","D.带下量多","E.便溏"]
胰腺主胰管的直径为（） ["3.5mm","2.5mm","1mm","4.0mm","5.0mm"]
分析方法（白盒方法）中常用的方法是（）方法。 ["路径测试","等价类","因果图","归纳测试"]
下列药物对儿童急性白血病效果良好的是（） ["博来霉素","甲氨蝶呤","紫杉醇","三尖杉酯碱","顺铂"]
何谓造血干细胞？造血干细胞必须具备哪些特征？
