Isobars on a synoptic chart are useful

1、（）scale charts are used for harbors.

（）scale charts are used for harbors.ASmallBLargeCLoranDRoute

2、Depiction of TSS's on charts uses（）as

Depiction of TSSs on charts uses（）as the primary color.AmagentaBdeep redCbright redDred

3、Isogonic lines are lines on a chart in

Isogonic lines are lines on a chart indicating （）.Apoints of equal variationBpoints of zero variationCthe magnetic latitudeDmagnetic di

4、On a hydrocarbon flammability chart th

On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.Aminimum oxygen content lineBcritical displacement lineCcritical dilution lineDupper threshold limit

5、When using a Lambert conformal chart i

When using a Lambert conformal chart in high latitudes，angles such as bearings are measured in reference to （）.Athe meridian through the obje...

6、The soundings on the chart are based o

The soundings on the chart are based on the depth of water available at （）.Amean low waterBmean lower low waterCmean high waterDmean high water spring