当测得某天然水的碱度为2.6mmol/L；硬度为2.2mmol/L，下面那种表述是错_爱下问搜题

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问题单项选择题

当测得某天然水的碱度为2.6mmol/L；硬度为2.2mmol/L，下面那种表述是错误的（）。

A.碳酸盐硬度为2.2mmol/L

B.非碳酸氢盐硬度为零

C.永久硬度为0.4mmol/L

D.负硬度为0.4mmol/L

答案

参考答案：C

选择题

给下列问句选择正确答语，将序号填在题前括号里。

1. What is Mike doing? [ ]

A. I'm doing my homework.

B. He is doing his homework.

2. What time do you go home?[ ]

A. It's 11:30.

B. At 11:30.

3. Do you want to go to the Children's Center?[ ]

A. Sure.

B. Yes, you do.

4. What is your grandma doing?[ ]

A. He is cooking lunch.

B. She is cooking breakfast.

问答题

德育的任务有哪些？