单词	abac scale
释义	ABAC scale ABAC scale A nomogram for obtaining the conversion angle to apply when plotting great circle bearings on a mercator projection. ABAC scale ABAC scale A nomogram for determining the conversion angle to apply when plotting great-circle bearings on a Mercator projection. ABAC scales are printed on the margins of Mercator plotting charts. Scales A and C are interrelated, as are B and D. In the illustration, the ABAC scale measures the conversion angle for two places that have a 16° change of longitude between them and a mean latitude of 50°. The conversion angle in this case is 6°.
随便看	helpfully helpfulness helpful responses questionnaire help function help get a foothold help get a foothold in help get a foothold in it help get a foothold in something help haiti help haiti now help her along help her back help her back to help her down help her get a foothold in help her in help her into help her off help her off with help her on help her on with help her out help her out of a fix help her out with help herself

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