二、航程及其测定 1．计程仪分类 相对计程仪(relative log)是记录船舶相对于水的航速与航程，计风不计流”； 回转式计程仪、水压式计程仪、电磁式计程仪。
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relative log exposure 相对曝光量对数
The normalize check box determines whether The Times are shown relative to the start of the log (normalized) or in absolute time (unnormalized).
Normalize复选框确定是使用相对于日志(规范)开始的时间还是使用绝对时间(非规范)。
Electromagnetic Log is a relatively Log, and for single Log, the only measurement of the vertical ship relative speed of water, range, not conducive to the manipulation of large ships.
电磁计程仪是一种相对计程仪，且为单轴计程仪，只能测量船舶相对水的纵向航速、航程，不利于大型船舶的操纵。
In the UK's case, the correlation between relative terms of trade and the real effective exchange rate is positive, although, taking log differences, the correlation is only around 0.3 since 1988.
就英国而言，相对贸易条件与实际有效汇率之间的关联，是积极的，虽然在采用各种对数级差的情况下，从1988年以来的相关系数大约仅为0.3。
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