打完一份稿件，甲需要4小时，乙需要6小时，甲、乙二人所用时间的整数比是_1，工作效率的最简整数比是_2．_刷题宝

题干

打完一份稿件，甲需要4小时，乙需要6小时，甲、乙二人所用时间的整数比是____，工作效率的最简整数比是____．

上一题下一题 0.0难度选择题更新时间:2011-06-16 11:00:35

答案(点此获取答案解析）

2：3,3：2

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函数f（x）=lnx+x﹣2的零点个数是（　　）

同类题2

阅读短文，选择正确的答案。

This is Lucy and that is Lily. Lucy is 12 years old. Lily is 12 years old, too. Lucy looks like Lily and Lily looks like Lucy, too.

They look the same. They are twins. But they have different hobbies. Lucy likes listening to music and drawing pictures. Lily likes dancing and playing basketball. They are American. They are new students in Jim's class .They are in Grade Six. Jim often looks after them. They are new friends. They go to a shop. They would like something to eat and drink. Lucy would like some bread. Lily would like a bottle of orange. Jim would like some apples.

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进行生物组织样液中还原糖的检测时，下列材料中不适宜的是（　　）

同类题4

某人用400元购买了8套儿童服装，准备以一定价格出售．如果每套儿童服装以55元的价格为标准，超出的记作正数，不足的记作负数，记录如下：
＋2，－3，＋2，＋1，－2，－1，0，－2.(单位：元)
(1)当他卖完这8套儿童服装后是盈利还是亏损？
(2)盈利(或亏损)了多少钱？

同类题5

已知椭圆C：

\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1 (a > b > 0)

，圆Q：x²+y²﹣4x﹣2y+3=0的圆心Q在椭圆C上，点P（0，1）到椭圆C的右焦点的距离为2．

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