单项选择题

伦敦发明家罗伯特·约翰·泰尔斯发明了一种叫Rolito的轮滑鞋并申请专利，这双鞋是由几个轮子成一条线而构成

A．3
B．5
C．8
D．10

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多项选择题

When implementing location management, you should ().
A、If there is a map, there should be an object, and if there is anobject, there should be a location.
B、If there is a location, there should be a sign, and if there aresigns, they should be classified.
C、Locate items according to the map.
D、Arrange by category, and material should be consistent with accounts.

单项选择题

与要约的内容不存在实质差异的回复可以构成承诺。（）

A．对
B．错