【单选题】设集合A、B是非空集合,定义A×B={x|x∈A∪B且x?A∩B},已知A= {x|y= 2x- x 2 } ,B={y|y=2x 2 },则A×B等于( )
【简答题】The proposal that the head of the team made at the meeting sounds (reason) . 2、Generally speaking, once you (make) the payment, the goods should be delivered within a week. 3、The company suffered grea...
【简答题】Additional Listening 01 Scientists Aim to Explore Area of Life 1000 Meter Under the Sea Words in This Story thrive –v. to grow and develop successfully compartment –n. a separate area within a vehicle...
【单选题】设集合A= ( - ∞, 2),B=[-2, +∞ ),A∪B( )
【单选题】设集合 A=(2 , +∞),集合B=[1 , 4]则A∩B是( )
【单选题】电影最早产生于哪一年?它被称为第几艺术呢?
A.
1895 年 12 月 28 日 ; 第七艺术
B.
1990 年 10 月 30 日 ; 第七艺术
C.
1991 年 4 月 30 日 ; 第七艺术
D.
1890 年 12 月 30 日 ; 第六艺术
【简答题】Additional Listening 01 Scientists Aim to Explore Area of Life 1000 Meter Under the Sea Words in This Story thrive –v. to grow and develop successfully compartment –n. a separate area within a vehicle...
【单选题】设集合 A=(-∞,2], 集合B = 〔-2,+ ∞),则 A∪B= ( )