某学生的实验报告所列出的下列数据中合理的是_刷题宝

题干

某学生的实验报告所列出的下列数据中合理的是（）

A：用10ml量筒量取7.13ml稀盐酸

B：用托盘天平称量25.20g NaCl

C：用广泛pH试纸测得某溶液的pH为2.3

D：中和滴定时用去某浓度的碱溶液21.70mL

上一题下一题 0.0难度选择题更新时间:2013-03-03 08:39:12

答案(点此获取答案解析）

D

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下列4个事件：①异号两数相加，和为负数；②异号两数相减，差为正数；③异号两数相乘，积为正数；④异号两数相除，商为负数．必然事件是____，不可能事件是____．（将事件的序号填上即可）

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同类题3

A:Hello!

B:Hi,Lily! Nice to see you again.

A: ____

B:.I'm fine. And you?

A:Oh,not bad You look different, Bob. ____

B:Yes. To tell you the truth, ____

A:Oh,really? What did you change?

B: I watched too much TV and played too many computer games.I always felt tired. Now I changed my eating habits and I exercise more these days. ____

A:Oh, ____ You look active now!

B:T hank you. I feel good,too!

Have a lovely day!

I changed many things about myself.
How are you?

You changed many things about yourself.

Did you change something about yourself?

I won't play too many computer games.

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①作出△ABC关于原点O中心对称的图形；

②将△ABC绕原点O按顺时针方向旋转90°后得到△A₁B₁C₁，画出△A₁B₁C₁，并写出点A₁的坐标．

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卢沟桥的炮火促成了中华民族的全民族抗战。由彭德怀指挥八路军在敌后战场发动的大规模战役是（）

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