There are bond and bond in N2.
A: 1σ和1π
B: 2σ和2π
C: 1σ和2π
D: 2σ和1π
A: 1σ和1π
B: 2σ和2π
C: 1σ和2π
D: 2σ和1π
举一反三
- 20.A triple bond contains ___ sigma bond(s) and ___ pi bond(s). A: 0, 3 B: 3, 0 C: 2, 1 D: 1, 2
- The value of a bond depends on1. the bond's coupon2. the maturity date3. possible interest rates earned on competitive bonds A: 1 and 2 B: 1 and 3 C: 2 and 3 D: 1, 2, and 3
- 单色光从真空中进入折射率为n的介质中,入射光的频率ν1和波长λ1与折射光的频率ν2和波长λ2有如下关系() A: ν1=ν2，λ1=λ2 B: λ1=nλ2，ν1=ν2/n C: λ1=λ2，ν1=nν2 D: ν1=ν2，λ1=nλ2
- 人的初级精母细胞、次级精母细胞和精子中染色体数目的比例与DNA分子数目的比例分别是 A: 4∶2∶1和4∶2∶1 B: 2∶1∶1和4∶2∶1 C: 2∶2∶1和2∶1∶1 D: 2∶1∶1和2∶2∶1
- 设`\n`阶方阵`\A`满足`\|A| = 2`，则`\|A^TA| = ,|A^{ - 1}| = ,| A^ ** | = ,| (A^ ** )^ ** | = ,|(A^ ** )^{ - 1} + A| = ,| A^{ - 1}(A^ ** + A^{ - 1})A| = `分别等于（ ） A: \[4,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] B: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n + 1)}^2}}},2{(\frac{3}{2})^n},\frac{{{3^n}}}{2}\] C: \[4,\frac{1}{2},{2^{n + 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\] D: \[2,\frac{1}{2},{2^{n - 1}},{2^{{{(n - 1)}^2}}},2{(\frac{3}{2})^{n - 1}},\frac{{{3^n}}}{2}\]