A:R1=0.134Ω R2=0.536Ω
B:R1=0.341Ω R2=0.853Ω
C:R1=0.536Ω R2=0.134Ω
D:R1=0.853Ω R2=0.341Ω
某生物体细胞中含有12对染色体,在减数细胞分裂后形成的子细胞中,染色体的数目是( )
My mom always _______ she's busy.