单项选择题
A.平吃水B.适当首倾C.适当尾倾D.横倾
A.12s,15sB.12s,20sC.20s,12sD.15s,20s
A.左满舵到右满舵B.右满舵到左满舵C.一舷35°到另一舷30°D.一舷35°到另一舷35°
A.避免携带影响罗经指向准确性的物品B.在罗经附近随便堆放铁器C.随身携带钢铁制品D.在罗经甲板敲锈
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