The ZXMP M900 is applicable to ultra long-haul transmission and the system reach can be up to （） at the maximum 。
- A、640km
- B、2000km
- C、560km
- D、800km
正确答案:B
答案解析:有
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The ZXMP M900 is applicable to ultra long-haul transmission and the system reach can be up to （） at the maximum 。
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