20.A triple bond contains ___ sigma bond(s) and ___ pi bond(s).
A: 0, 3
B: 3, 0
C: 2, 1
D: 1, 2
A: 0, 3
B: 3, 0
C: 2, 1
D: 1, 2
举一反三
- 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
- There are bond and bond in N2. A: 1σ和1π B: 2σ和2π C: 1σ和2π D: 2σ和1π
- Bond ratings measure the bond's credit risk. ( )
- Which of the following bond link the nucleotide in the primary structure of nucleic acid? () A: peptide<br/>bond B: hydrogen bond C: 3′,5′-phosphodiester bond D: salt bond E: hydrophobic bond
- 三相异步电动机稳定转动的转差率s的范围是（） A: 0＜s＜1 B: 0＜s＜2 C: 1＜s＜3 D: 1＜s＜2