If a bearing is designated by the number 305, it means that the bearing is of

A. Medium series whose bore is 5 mm

B. Medium series whose bore is 25 mm

C. Light series whose bore is 25 mm

D. Light series whose bore is 5 mm

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  4. In second type of levers,
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  23. The included angle in unified of American National threads is
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