下列异常舌态中，哪一种是中风先兆（） ["歪斜舌","痿软舌","短缩舌","吐弄舌","强硬舌"]
淀粉酶的特征不包括（） ["可作用于淀粉α-1，4糖苷键和α-1，6糖苷键","分子量为5.5～6.0kD","最适pH为6.9","由胰腺分泌","是正常时不会出现在尿中的血浆酶"]
高碳钢指含碳量为（）. [">0.25%",">0.55%",">0.70%"]
钢中常存在的杂质元素，其中（）是有益元素. ["Si和Mn","P","S"]
饭后嗜睡，神疲倦怠，食少纳呆者为（） ["湿邪困脾","肝郁犯脾","心肾阳虚","热入心包","心胆气虚"]
简述组织货源方法是什么？
