【单选题】设有平面α、β、γ,直线m、n、l,给出以下命题: ①m//α,m//β,则α//β; ②m⊥l,n⊥l,则m//n; ③l⊥α,l//β,则α⊥β; ④α⊥l,β⊥l,α//β 在这四个命题中,正确的命题有
【简答题】We can learn from the passage that the two talk shows ________. A) have monopolized the talk show circuit B) exploit the weaknesses in human nature C) appear at different times of the day D) are targe...
【简答题】补全对话。 (L=Lucy; T=Tom) L: Hello, Tom? T: Lucy? Hi? (1)___________________? L: I'm in England! I'm calling to say 'Happy New Year!' to you. T: (2)___________________? L: So, how is it going there? T: Gr...
【简答题】From the last two paragraphs we can learn that _________. A) the only way to make changes in the country is to vote B) to vote is in fact a right to play a part in the country C) even if the candidate...
【多选题】无差异曲线的特征包括( )。
E.
在无差异曲线的坐标图上,任一点都应有一条无差异曲线通过
【简答题】无差异曲线特征: A、无差异曲线自左上方向右下方倾斜 B、无差异曲线具有密集性 C、无差异曲线的斜率为负值 D、离原点越远的无差异曲线代表的效用水平越高 E、无差异曲线表示任何物品的效用无差别