【单选题】
A C 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 Manulacturers shall prepare all text both in one and two columns separatoly,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
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