单项选择题

在建设工程招标投标活动中,投标文件属于( )。 A.要约 B.新要约 C.要约邀请 D.承诺

A.要约
B.新要约
C.要约邀请
D.承诺
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多项选择题
慢慢加热天然DNA溶液,260nm处的紫外吸收显著增加,出现这种现象的原因是()

A.水分蒸发,DNA溶液浓缩
B.DNA双链解链变成单链
C.出现了碱基堆积
D.碱基解堆积

单项选择题
Which of the following is not true of Intel?()

A.Intel is one of the biggest tech companies in the world.
B.Recruiters of Intel have a strong interest in students majored in engineering,management and linguistics.
C.Intel makes many products,such as semi-conductor and chipsets.
D.Intel offers a variety of internships and rotational programs to give students a taste of various departments.

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