[问答题,简答题] 心电轴的测量及意义

由桂皮酸和醋酸-丙二酸途径复合生成的是（） ["黄酮","甾体","生物碱","香豆素","蒽醌"] 有机溶剂消耗溶剂量最小的方法是（） ["渗漉法","回流法","连续回流法","水蒸气蒸馏法","煎煮法"] 不需要加热的提取方法是（） ["渗漉法","回流法","连续回流法","水蒸气蒸馏法","煎煮法"] 各波振幅及时间的测量 心率的计算 心电轴的测量及意义