不等式xx-2≤0的解集是( )_刷题宝

题干

不等式xx-2≤0的解集是( )

A： $0, 2)$

B： $0, 2$

C： $(- \infty, 0 \cup 2, + \infty)$

D： $(- \infty, 0) \cup (2, + \infty)$

上一题下一题 0.0难度选择题更新时间:2018-12-20 07:09:22

答案(点此获取答案解析）

B

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阅读短文，根据短文判断正误，用T或F表示。

A

The Marathon

The marathon is the longest race at the Olympics. You have to be a very strong runner to win the marathon.

The marathon is 42.195 km long. Why is it 42.195 km and not 43? The 1908 Olympics was in London. The King of England wanted his children to watch the marathon so the race started at the gate of his palace. From there to the finish line was 42.195 km.

One of the best marathon runners was Abebe Bikila. He was from Ethiopia. He won the gold medal in the marathon at the 1960 Olympics. He ran the whole race without shoes on!

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某建筑工地使用如图所示装置搬运建筑材料．已知柴油机的效率是40%，柴油的热值是4×10⁷J/kg，用此装置将一块重为3200N的建筑材料提升5m．历时4s，消耗的柴油为4g．

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生物圈养育着万物生灵，人和各种生物共同生活在这个大家庭里，它们各自承担着不同的角色。下面承担分解者角色的是( )
①淡水中的衣藻　②高山上的油松　③土壤中的细菌　④朽木上的蘑菇　
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同类题5

--- What is his room like?

--- It's very messy. There're mountains of dirty clothes everywhere

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