题目内容

【C13】

A. stiff
B. personal
C. crowded
D. comfortable

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______ are changes on charts due to changes in hydrography,topography,construction,removal

A. revised edition
B. new edition
C. small corrections
D. source data

【C8】

A. before
B. by
C. for
D. over

【C6】

A. effect
B. attempt
C. error
D. offer

【C11】

A. attention
B. process
C. knowledge
D. practice

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