分光比为1:2的光分路器的衰耗值为()dB
参考答案:3.6
31.I prefer a house in small coast village to________ in such a large city________ Sydney.
A.that; as
B.one; as
C.one; like
D.that; like
窗体由多个部分组成,每个部分称为一个“ 【12】 ”。