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【单选题】
航用海图的必备条件是 。
A.
图上恒向线为直线
B.
等角投影
C.
A+B
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【简答题】Complete each sentence with a word from the box. A. declining B. export C. home D. luxury E. mature F. mass G. niche H. profitable I. share J. unattractive ...
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