没有资料，就是标准：
Propelling chains shall have a shield from the crank to the gear wheel at the side where the leg of the child is nearest the chain (side A), and a shield around the crank on the opposite side (side B), (see Figure 7). The shield shall not have slots or holes with a width greater than 5 mm.
发表于 2011-10-28 19:55:45
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