由于()的存在,将导致光波的偏振状态沿光纤长度变化,导致偏振模色散。
A.线性效应
B.非线性效应
C.双折射效应
D.光纤辐照效应
参考答案:C
With the work ____, Mr. Lin went out for a swim. [ ]
A. having
B. done
C. doing
D. being done
细毛羊一年剪()次毛。
A.1
B.2
C.3
D.4