问题 多项选择题

OSN6800设备80波系统中配置有MCA(光谱分析板)和WMU(波长监控板),下面说法正确的有()

A、MCA板有MCA4和MCA8两种,只是提供的接口分别为4个和8个,主要功能是检测通道光功率、中心波长、光信噪比、光通道中的波长数量,类似于一个光谱分析仪,将检测出的信息上报给主控

B、WMU板的核心功能是与主控配合进行波长锁定,监视发端OTU波长偏移情况,通过邮箱传递给主控,主控根据波长配置表看是否要调节,如果要,将调节信息传递给OTU单板完成波长偏移调节

C、MCA、WMU单板可以配置监视发端和收端

D、MCA单板侧重于方便维护,WMU单板应用功能实现

答案

参考答案:A, B, D

选择题
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完形填空

     Louise was 72 years old and she lived by herself. The first thing she noticed when she came

downstairs that Sunday morning was that her    1   window was open. In fact, it was so wide open that

she had    2   closing it. Then she realized that things were not in their proper    3   . Finally, when she

found her empty    4  on the kitchen table, she realized the awful    5   . At first, she didn't know what to

do. Then she decided to   6   her son, Derek.

     Derek's wife Sybil answered the phone, "It's your mother," she    7   him, coldly. Louise told Derek

about the open window, about things being in the wrong places and about the    8   missing from her

purse.

     "All right," said Derek, "Don't    9   anything. I'll be    10   in half an hour."

     Louise    11   and made herself a pot of tea and some toast. Then she went from room to room

wondering    12  anything else was missing.

     When Derek arrived, he was content to   13   her looking so calm. "Have you rung the     14  ?" he

asked. "No? Then I'll do that straight away." So he rang the police.

     As it was Sunday,   15  the only detectives were out. However, the police were polite, but vague

(含糊的). "We'll send    16   round as soon as possible," they said.

     Derek telephoned his wife. "I'm not sure when I'll be home, love," he told her. "I've got to    17  for

the police." While Derek and his mother waited, Derek    18  the catches(挂钩)on the windows and

locks on the doors. All of them were old and some of the catches hardly    19   at all. Derek felt    20   .

His mother was an old woman, after all. "I'll have to change all these," he told her.