锉刀的锉纹号的选择主要取决于工件的加工余量、加工精度和表面粗糙度。
参考答案：对
What happened to Tracy [A] She broke her arm. [B] She hurt her back. [C] She broke her leg.
气味芳香药物的煎法是（）
A.打碎先煎
B.另煎
C.后下
D.包煎
E.另炖
