A.1/2/4
B.3/4/2
C.3/2/4
D.1/4/2
A.1、 2、3
B. 3、4
C. 2、3
D.2、4
Where does the author mention a contribution made by the government to the war economy?
A.Paragraph 3, sentence 1.
B.Paragraph 4, sentence 2.
C.Paragraph 3, sentence 4.
D.Paragraph 4, the last sentence.
设A={1,2,3},B={1,2,3,4,5},C={2,3},则(A∪B)+C=______
(1){1,2} (2){2,3} (3){1,4,5} (4){1,2,3}
A.1、 2、3、4
B.2、1、3、4
C. 1、4、2、3
D.2、4、1、3
设A={1,2,3},B={1,2.3.4,5},C={2,3},则(A∪B)∩C=______.
(1){1,2};(2){2,3};(3){1,4,5);(4){1,2,3}.
设|a|=4,|b|=3,夹角30度,向量a+2b,a-3b为边的平行四边形的面积为______