异交植物或动物可以用（）个公式来估计环境方差。 A: VE=VF1 B: VE=VP1 C: VE=VP2 D: VE=1/2(VP1+VP2)

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2022-07-25 问题

异交植物或动物可以用（）个公式来估计环境方差。 A: VE=VF1 B: VE=VP1 C: VE=VP2 D: VE=1/2(VP1+VP2)

2022-05-31 问题

TimBut what 1)—you’ve got so many bags? Oooh, 2) ! You’ve been 3) again? I hope you’re not 4). Last month you told me you spent 5) on face lotion, and today you’ve bought 6) . As an old saying goes, “7) .” If you like, I could help you 8) .

TimBut what 1)—you’ve got so many bags? Oooh, 2) ! You’ve been 3) again? I hope you’re not 4). Last month you told me you spent 5) on face lotion, and today you’ve bought 6) . As an old saying goes, “7) .” If you like, I could help you 8) .

2022-06-05 问题

1 I'm tired. I___________for ten hours. A: 've been working B: 've worked C: work

2022-05-31 问题

Watch the video clip again and fill in the blanks with the information you’ve got.TimBut what 1) —you’ve got so many bags?Oooh, 2) ! You’ve been 3) again?I hope you’re not 4) .Last month you told me you spent 5) on face lotion, and today you’ve bought 6) .As an old saying goes, “7) .”If you like, I could help you 8) .

Watch the video clip again and fill in the blanks with the information you’ve got.TimBut what 1) —you’ve got so many bags?Oooh, 2) ! You’ve been 3) again?I hope you’re not 4) .Last month you told me you spent 5) on face lotion, and today you’ve bought 6) .As an old saying goes, “7) .”If you like, I could help you 8) .

2021-04-14 问题

【单选题】rev(c(1,3,2,6,7,8,8,1,1,0))的运行结果 ? A. [1] 0 1 1 1 2 3 6 7 8 8 B. [1] 1 3 2 6 7 8 8 1 1 0 C. [1] 0 1 1 8 8 7 6 2 3 1 D. [1] 8 8 7 6 3 2 1 1 1 0

2021-04-14 问题

【单选题】A.f i ve B.g i ve C.d i ve D.dr i ve A. f i ve B. g i ve C. d i ve D. dr i ve

2022-10-24 问题

已知x(n)={1, 2, 3}，y(n)={1, 2, 1}，则x(n)*y(n)=________。（下划线表示n=0） A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}

2022-05-30 问题