A.2 B.4 C.6 D.8
A.波長(zhǎng)間隔×;10% B.波長(zhǎng)間隔×;20% C.波長(zhǎng)間隔×;5% D.波長(zhǎng)間隔×;1%
A.≦-4dBm B.≦-7dBm C.≦-2dBm D.≦4dBm