Using the notation Pt to designate this period's price level and Pt-1 to designate last period's price level, the formula for measuring the inflation rate from last period to this period is
A: [(Pt - Pt - 1) / Pt] × 100.
B: [(Pt -1 - Pt) / Pt - 1] × 100.
C: [(Pt - Pt - 1) / Pt - 1] × 100.
D: [(Pt -1 - Pt) / Pt] × 100.
A: [(Pt - Pt - 1) / Pt] × 100.
B: [(Pt -1 - Pt) / Pt - 1] × 100.
C: [(Pt - Pt - 1) / Pt - 1] × 100.
D: [(Pt -1 - Pt) / Pt] × 100.
举一反三
- 下列电池中电动势E最大的是 A: Pt | H2 (2 pø) | H+ (a = 1) || H+ (a = 1) | H2 (pø) | Pt B: Pt | H2 (pø) | H+ (a = 1) || H+ (a = 0.5) | H2 (pø) | Pt C: Pt | H2 (pø) | H+ (a = 1) || H+ (a = 1) | H2 (pø) | Pt D: Pt | H2 (2 pø) | H+ (a = 1) || H+ (a = 0.5) | H2 (pø) | Pt
- 标准氢电极是指： A: Pt(s)∣H2[p = 100kPa]∣OH-(a=1) B: Pt(s)∣H2[p = 101.325kPa]∣OH-(a=1) C: Pt(s)∣H2[p = 100kPa]∣H+ (a=1) D: Pt(s)∣H2[p = 101.325kPa]∣H+(a=1)
- 将反应H2（pθ）+1/2O2（pθ）= H2O(l) 设计成电池，下列正确的是（ ） A: Pt | H2（pθ）| H+（α）| O2（pθ）| Pt B: Pt | O2（pθ）| OH-（α）| H2（pθ）| Pt C: Pt | O2（pθ）| OH -（α1）|| H+（α2）| H2 （pθ）| Pt D: Pt | H2（pθ）| H+（α1）|| OH -（α2）| O2（pθ）| Pt
- 下列四个原电池中，其电池反应不为 H2(2pθ)→H2(pθ) 的电池是： A: Pt,H2(2pθ)|H+(a= 0.1)||H+(a= 0.2)|H2(pθ),Pt B: Pt,H2(2pθ)|H+(a= 10-8)|H2(pθ),Pt C: Pt,H2(2pθ)|H+(a= 0.1)|H2(pθ),Pt D: Pt,H2(2pθ)|H+(a = 0.1)||KCl(m = 1)|Hg2Cl2(s),Hg－Hg,Hg2Cl2(s)|KCl(m = 1)|H+(a = 0.1)|H2(pθ),Pt
- 若Pt表示静态投资回收期，Pt′表示动态投资回收期，对于一个确定项目来说，（ ）。 A: Pt大于Pt′ B: Pt等于Pt′ C: Pt小于Pt′ D: 无法确定Pt与Pt′的大