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- 1向量a=(0,1)b=(-1,1)则与2a-b反向的单位向量的坐标表示为___向量b+2a与向量a夹角的余弦值为___
- 2let's hurry , or we'll miss the early bus.改为复合句
- 3某抗酸药片含碳酸钙523mg,氢氧化镁180mg,每片该药可中和多少克溶质质量分数为6.2%的盐酸?(保留到0.01g
- 4读詹天佑有感450字
- 5he is the____________ (man who has others working for him)he is the of the house
- 6氢气与氦气的区别?他们的密度分别是多少?
- 7请教board和committee的区别?
- 8(1)甲车队有60辆汽车,乙车队有50辆汽车,如果要使乙车队车数比加车队车数的2倍还多5辆,那么应该从甲车队调多少辆车到乙车队?
- 9满足{1,2}⊊A⊆{1,2,3,4,5}的集合A的个数为( ) A.2个 B.3个 C.4个 D.7个
- 10Some of the (sing)come from Brazil.