How do the blue and pink cells differ? A. Blue: mitosis; pink: meiosis B. Blue: haploid; pink: diploid C. Blue: G1 phase; pink: G2 phase D. Blue: N=3; pink: N=4 E. Blue: N=3; pink: N=2
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【单选题】下列方程组中,是二元一次方程组的为( ) ① 2x-y=8 x+5y=9 ② x+5y=8 xy=3 ③ x-y=6 x 2 + y 2 =27 ④ x-y=3 3x-y=1 .