【判断题】
抖动和漂移与系统的定时特性有关
A. 对
B. 错
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答案
A
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暂无解析
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【判断题】
分光器带有一个上行光接口，若干下行光接口。从上行光接口过来的光信号被分配到所有的下行光接口传输出去，从下行光接口过来的光信号被分配到唯一的上行光接口传输出去。只是光信号从上行光接口转到下行光接口的时候，光信号强度/光功率将下降。
A. 对
B. 错
【判断题】
光缆中的光纤是由类似于玻璃的高纯二氧化硅组成，所以严禁挤压、严重弯曲光缆，不过光纤受水的影响不大，所以光缆可以在潮湿的环境下工作，而且不用特别的防水措施。 （）
A. 对
B. 错
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The terms for a Senator and Representative are and years respectively.
A. A. two, four
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According to the Constitution, a candidate for President must be .
A. A. at least 35 years old
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The following except are all powers of the President.
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All the following except cannot make legislative proposal.
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The Bill of Rights .
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The Constitution of the United States .
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The U. S. Constitution came into effect in .
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Abraham Lincoln issued to grant freedom to all slaves.
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