M(−1,2) ， N(3,0) 两点之间的距离为_刷题宝

题干

M(−1,2) ， N(3,0) 两点之间的距离为（）

A： $2 \sqrt{2}$

B： $4$

C： $2 \sqrt{5}$

D： $5$

上一题下一题 0.0难度选择题更新时间:2018-08-21 10:47:57

答案(点此获取答案解析）

C

同类题1

如图，AC是电线杆AB的一根拉线，测得BC的长为6米，∠ACB=50°，则拉线AC的长为（　　）

同类题2

根据对话内容，将方框内符合对话情景的句子抄写在对话空白处，使对话恢复完整。选项有两项是多会的。

—Hi, Mrs. Green How was your trip to the United States?

—It was wonderful____

—____

—I was there for a month.

—Great.____

—Yes, it's a wonderful and exciting city.

—____

—The city is the main business and cultural center in the Midwest It's famous for its music opera and theaters as well as for its excellent museums.

—____

—Yes, sure. What would you like to know?

What's it famous for?

How long were you there?

Can you tell me a little more about it?

I really enjoyed it.

How long were you there?

And did you go to Chicago?

You should go there in winter or spring.

同类题3

在横线里填“＞”、“＜”或“＝”。

27+9____36 35+7____40 86____76+8 89____79+8

48+5____54 88-6____85 61____53+9 100____76+8

同类题4

日本血吸虫属于扁形动物。(判断对错)

同类题5

酶具有高效性、专一性和多样性的特性，其活性受温度和pH等因素影响。氯化铁是—种无机催化剂，其溶液能催化过氧化氢溶液分解。肝脏组织细胞中也有一种能催化过氧化氢溶液分解的酶。为了研究生物酶与无机催化剂的催化效率，某同学设计了一个实验，以下是该实验的几个步骤：

①向2号试管内滴人几滴氯化铁溶液，作为对照

②将点燃但无火焰的卫生香分别放在1、2号管的管口，仔细观察，会发现1号试管口的卫生香燃烧猛烈

③取两只洁净的试管，编上号，并且注入10 毫升质量分数为3％的过氧化氢溶液

④轻轻振荡这两只试管，使试管内的物质混合均匀，会发现1号试管的气泡多且最先产生

⑤取豌豆大小的新鲜肝脏，放在培养皿中迅速剪碎并投人到1号试管中

小学学科试题库

初中学科试题库

高中学科试题库