衡量一个玉米自交系好坏的指标一般是（）。
A.一般配合力
B.特殊配合力
C.一般配合力和特殊配合力
D.杂种优势
参考答案：A
This mobile phone is of good quality. If it ______ break down within the first year, we would repair it
at our expense. [ ]
A. would
B. should
C. could
D. might
简述稽核实施阶段的主要工作步骤
