问答题

金属质地，具有良好的韧性和弹性，而且具有反光潜质。

答案：坚硬

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多项选择题

When will you use a handout when you deliver an academic presentation?

A．You have used other visual aids.
B．Your information is too detailed to fit on a slide.
C．You want your audience to have a full record of your findings.
D．You are not sure of your information.

单项选择题

γ-羟基酸加热脱水得到的产物是（）

A．交酯
B．α,β-不饱和酸
C．内酯
D．β,γ-不饱和酸