下列心肌标志物中半寿期最短的是 ["A．Mb","B．CK-MB","C．cTn","D．CRP","E．LD"]
组成LD2同工酶的四聚体为 ["A．H4","B．M4","C．H3M","D．HM3","E．H2M2"]
下列各项心肌标志物分子量最大的是 ["A．Mb ","B．CK-MB ","C．LDH ","D．cTnI ","E．AST "]
鸟氨酸循环合成尿素是 ["A．肝脏的特异性功能","B．肾脏的特异性功能","C．脾脏的特异性功能","D．肾小球的特异性功能","E．胰腺的特异性功能"]
有效肾单位损失多少以上时，血尿素才开始上升 ["A．30％","B．50％","C．80％","D．10％","E．5％"]
辅助接地母线若为裸铜线，其截面积应不小于（）；若为钢绞线其截面应不小于（）。
