Folding mechanisms now include requirements for locking devices or other means to prevent unexpected or sudden movement or collapse of the article.
新的折叠装置要求包括锁闭装置或其它防止物品意外或突然移动或倒塌的装置。
Folding mechanisms now include requirements for locking devices or other means to prevent unexpected or sudden movement or collapse of the article.
新的折叠装置要求包括锁闭装置或其它防止物品意外或突然移动或倒塌的装置。
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