叶片呈披针形，基部耳状偏斜，不对称，孢子囊群在下表面侧脉间多见的药材是（）
A.有柄石韦
B.石韦
C.庐山石韦
D.大青叶
E.枇杷叶
参考答案：C
Matthew listened with full attention in chemistry lesson, _____to miss any point from the teacher.
[ ]
A. not trying
B. trying not
C. to try not
D. not to try
标准氢电极的电极电位为（）伏，测定条件是[H+]=mol/L，pH2＝（）MPa。
