问题 单项选择题

下列溶液浓度的表示方法或单位正确的是()

A.摩尔浓度(mol/L)

B.当量浓度(N)

C.1%酚酞

D.物质的量浓度(cB.

答案

参考答案:D

写作题

书面表达

Jill是一名初三的学生。她很喜欢玩电脑,但她现在每天有很多的功课,没时间去做自己的兴趣爱好。她感到很苦恼。她写了封信给Sigmund,希望能得到一些建议。

不少于60个字,开头结尾已给出,不计数。

Dear Sigmund,

I am a Grade 9 student.                                                       

                                                                             

                                                                             

                                                                             

                                                                             

                                                                             

                                                                             

                                                                             

                                                                             

Best wishes.

Yours sincerely,

Jill

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