问题
单项选择题
Chart/Publication correction record Card system ensures that every chart is properly corrected（）.
A.in use
B.prior to use
C.after use
D.When chart received on board
答案
参考答案：B
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Chart/Publication correction record Card system ensures that every chart is properly corrected（）.
A.in use
B.prior to use
C.after use
D.When chart received on board
参考答案：B