Zhang Liang’s planTo spend it on 1) .To 2) to those in need of 3) .To 4) to watch a film.
举一反三
- 【单选题】设集合 A ={1, 2, 3, 4} , A 上的二元关系 R ={<1, 2>,<1, 4>,<2, 4>,<3, 3>} , S ={<1, 4>,<2, 3>,<2, 4>,<3, 2>} .则关系 ()={<1, 4>,<2, 4>} A. R È S B. R Ç S C. R- S D. S - R
- 39号元素钇的核外电子排布式是下列排布中的( ) A: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 1 5 s 2 B: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 2 5 p 1 C: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 2 5 s 1 D: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 2 5 p 1
- 设集合A={1 , 2 , 3 , 4}上的二元关系 R = {<1 , 1>,<2 , 2>,<2 , 3>,<4 , 4>}, S= {<1 , 1>,<2 , 2>,<2 , 3>,<3 , 2>,<4 , 4>}, 则S是R的( )闭包.
- Watch one of these 6 films and write a film critique. The critique can be a discussion of the film’s content, an evaluation of the film language or an analysis of the film’s characters.
- 假如集合 S={ 1, 2, 3, 4 },后面 5 个命题中,哪些是正确的?ⅰ) { {2} }⊆P(S),ⅱ) { 1, 3 }⊆P(S),ⅲ) { 1, 3 }∈P(S),ⅳ) { {2, 4} }⊆P(S),ⅴ) { 4 }⊆P(S)