阶跃型光纤的纤芯折射指数n1=1.51,相对折射指数差Δ=0.18%,纤芯半径a=3.5μm,工作波长λ=1.31μm。 求:
光纤的归一化频率V?
参考答案:
Could you please the radio? The boy is sleeping. [ ]
A. turning
B. not turn on
C. turn on
下列有关元素周期律的叙述中,正确的是 ( )
A.氧化性强弱:F2<Cl2
B.金属性强弱:K<Na
C.酸性强弱:H3PO4<H2SO4
D.碱性强弱:NaOH<Mg(OH)2