多项选择题

“挑战杯”比赛选题一般具有（）、（）、（）和（）四大特点。 A.
时代性 B.
先进性 C.
专业特色 D.
能够解决当下所面临的问题

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单项选择题

Which of the following statements is incorrect ()

A．Entrepreneurs must conduct market research and be good at discovering and capturing market opportunities.
B．Venture capital is not everything, but without capital, everything is nothing.
C．The success of an entrepreneurial project must rely on the support of national policies.
D．To change entrepreneurial ideas into practices, entrepreneurs must have relevant knowledge and skills.

单项选择题

以下关于刷牙的方法的叙述，不正确的是（）
A、刷牙时应将牙刷的毛面与牙呈90度
B、将牙刷毛面轻轻放于牙沟部位
C、以快速的环形来回刷动
D、每次只刷2~3个牙齿
E、用牙刷毛而的项部以环形方式刷洗前排牙齿的内面