31.負責當值之航行員在每次當值期間應至少測定羅經誤差幾次?
(A)1
(B)2
(C)3
(D)4
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統計: A(44), B(6), C(0), D(2), E(0) #1199012
統計: A(44), B(6), C(0), D(2), E(0) #1199012