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单选题
439.All text shall be prepared in one or two columns with justification at the discretion of the manufacturer, however, two columns are preferred for ease of reading( )
A
The manufacturer shall prepare all text in either one or two columns with justification at his own discretion, but two columns are preferable for readability.
B
Manufacturers shall prepare all text both in one and two columns separately, however, two columns are better for reading.
C
According to the manufacturer explanations all text shall be prepared in one or two columns, however, two columns have better visual effect.
答案解析
正确答案：A
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