变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。
Zoom lens a lens whose focal length can be varied continuously over a substantial range.
本文对矩量法的误差来源、误差界以及误差的主要作用范围进行了较全面的分析，并据此提出了若干提高准确度的改进措施。
In this paper the causes of errors, the error bounds and the action regions of errors in the moment method are analysized in detail. Some improvements on the accuracy of moment Solution are proposed.
变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。
Zoom lens a lens whose focal length can be varied continuously over a substantial range. one zoom lens can replace several fixed focal -length lensed but results are likely to be inferior.
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