A:tell
B:put
C:talk
D:speak
在遗传学实验中,F1与隐性类型测交,后代表现型的种类及比例应为( )
— Jack, don't always copy what others do. your head, please.
— Thanks for telling me.
任何数乘0与0乘任何数,结果都是0.
如果a2=25,b=3,且a<b那么 a+b 的值为 ( )