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单选题
Identify revisions, additions and deletions by a vertical black line along the outside of the page opposite only that portion of the printed matter that was changed.
A
A vertical black line should be drawn to mark any revision, addition and deletion along the outside of the page opposite to the changed contents.
B
Whenever the printed matter is to be revised, replenished or updated, mark a black cross on the right margin of the page opposite to the changed portion .
C
In order to revise, supplement and delete the printed material, a perpendicular black line must be used to identify the changed portion along the margin of the page.
答案解析
正确答案：A
