用300颗种子做发芽实验,有285颗发芽,这些种子的发芽率为______%.
285300×100%=95%;
答:发芽率是95%;
故答案为:95.
When she was three years old, she _____ sing several English songs. [ ]
A. may
B. must
C. can
D. could
什么是固定性制造费用成本差异的“双差异分析法”和“三差异分析法”?