| 摘要 |
The invention includes a base member configured to be parallel to a support surface, a support member pivotally coupled to the base member and an extension member. The support member is movable between a first configuration in which said support member is substantially perpendicular to the base member and a second configuration in which the support member is substantially parallel to the base member and said support surface. The extension member is movable between a first configuration in which the extension member is retracted and a second configuration in which the extension member is coupled to the support member and angularly disposed with respect to the support member.
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