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根据不同的应用场合，ITU-T建议对不同类型的SDH光接口进行了规范，如S-4.1，其中S表示短距离传输传输速率为（），4表示，1表示波长为（）。
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【单选题】一名统计学专业的学生为了完成其统计作业，在《统计年鉴》中找到了2006年城镇家庭的人均收入数据。这一数据属于( )。
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【单选题】Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the...
A.
The equipment divers use.
B.
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