热能转化机械能的途径是什么?
参考答案:
作功
隐性黄疸的胆红素界限值是().
A.1.71~3.42μmol/L
B.17.1~34.2μmol/L
C.17.1~171μmol/L
D.1.71~3.42mmol/L
E.17.1~34.2mmol/L
3-叔丁基吡啶