Chart legends which indicate a conspic

1、Which chart symbol indicates the botto

Which chart symbol indicates the bottom is clay（）.AClyBClaCClDC

2、Which of the following indicates a gra

Which of the following indicates a grave and imminent danger requesting immediate assistance on radio telephone?（）.ASOSBMaydayCSecuriteDPAN

3、Lines on a chart which connect points

Lines on a chart which connect points of equal magnetic variation are called （）.Amagnetic latitudesBmagnetic declinationsCdipDisogonic line

4、Which of the followings best indicates

Which of the followings best indicates how many tons of cargo a vessel can carry?（）.ABale cubicBDeadweight tonnage of cargoCLoaded displacementDGross tonnage

5、Which display indicates a vessel condu

Which display indicates a vessel conducting mineclearance operations（）.AThree balls in a vertical lineBTwo balls in a vertical lineCOne ball near the foremast and one ball at each yardarmDOne diamond near the foremast and one ball at each yardarm

6、Which radiotelephone signal indicates

Which radiotelephone signal indicates receipt of a distress message?（）ARoger wilcoBRomeo，romeo，romeoCSOS acknowledgedDMayday roger