"Chart /publication correction record card system ensure that every chart is properly corrected ___.
A.in use
B.prior to use
C.after use
D.when the chart is received on board"
正确答案是B
"Chart /publication correction record card system ensure that every chart is properly corrected ___.
A.in use
B.prior to use
C.after use
D.when the chart is received on board"
正确答案是B