原理图必须有足够的尺寸，使图例、符号、装置、代码等都能被视力正常的人看清。应尽量避免使原理图翻页。

【单选题】
A The schematic diagram must be of sufficient size that legends, symbols, devices, codes etc., are readable by persons with normal vision.Turn-page schematic diagrams shall be avoided to the extent practical.
B The schematics symbols, devices, codes etc. must be legible, so people with normal vision should avoid turning the schematic pages as much as possible.
C Schematics must be readable to a normal visioned person,so legends,symbols device codes,etc.,should be of sufficient size.The schematic diagram should be designed to turn over the page when the content is necessary.

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