搜题请搜索小程序“爱下问搜题”
问题 解答题

小英4次语文测验的平均成绩是89分，她每次测验都得了89分．______．（判断对错）

答案

小英4次语文测验的平均成绩是89分，她每次测验的成绩可能比平均数大一些，也可能比平均数小一些，所以她每次测验都得了89分，说法是错误的；

故答案为：×．

选择题

下列说法中正确的是                                                                                                      （   ）

A．等物质的量浓度NaCl和CH3COONa溶液等体积混合，

c(Cl-)>c(Na+)>c(CH3COO-)>c(OH-)>c(H+)

B．25℃时，若10mL盐酸（pHa）与100mLBa（OH）2溶液（pHn）混合后恰好中和，则pHa+pHn=13

C．等物质的量浓度的硫酸与醋酸钠溶液等体积混合，c（SO42-）+c（OH-）=c（H+）+c（CH3COOH）

D．向氨水中加水稀释，减小
查看答案
听力题

小题1:Turn on your computer and (连接) to the Internet.

小题2:It’s an __(荣幸) to talk with all of you here.

小题3:The English has also __(吸收) in many new words from other languages.

小题4:(行动) speak louder than words.

小题5:My teacher told me that I was an (优秀的) student.

小题6:We __(成功) in finishing the hard work yesterday.

小题7:The boss has ­­­­­­­­­(大概) gone home.

小题8:If we go to the West Hill, we’ll see bees and butterflies __(跳舞).

小题9:What’s the p of China?  It’s about 1.3 billion .

小题10:I hope the government will s_ the problems soon.
查看答案