题干
.
The role change from husband to father, although difficult, doesn’t seem so great as___________from wife to mother.
The role change from husband to father, although difficult, doesn’t seem so great as___________from wife to mother.
A：one
B：that
C：thi
D：those
答案(点此获取答案解析）
B
的导函数是
，若
在原点处的切线方程为 （ ）