【单选题】下列维生素B族中有( )与氨基酸代谢有关。
【单选题】The loss of () from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.
【简答题】已知函数f(x)=2 2x-1 -2 x -4, (1)求f(x)的零点; (2)求f(x)的值域.
【简答题】中医认识病因,通过分析疾病症状、体征来推求,这种方法称之为___。