正确答案: B

盐：纯碱、小苏打、硫酸铝

题目：分类法是化学学习和研究的重要方法之一。下列分类正确的是【】

解析：B

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学习资料的答案和解析：

[单选题]（ ）是预测将来某一时期的平均预测值的一种方法。该方法按对过去若干历史数据求算术平均数，并把该数据作为以后时期的预测值。

简单移动平均法

[单选题]Dear Linda，I’ve got a problem and as．l don't know what to do，l think I'd write to you and ask for your advice．I have worked at a (11) factory for about two months till now．It's a part-time job，so I only work in the evening．I've recently (12) that one of my workmates is stealing． From time to time，l notice that he puts a piece of meat under his trousers just (13) he leaves the facto- ry． Now the manager has found that things are (14) ． But he says that all this (15) after I started working．What should I do? Maybe I (16) tell that workmate I knew (17) he was doing． Or possibly I should go to the manager and tell him who was (18)meat．I think I-m in a(n) (19) position. Please tell me how I can solve this problem．I'd like to have your (20) ．Best wishes，

meat

解析：11．D【解析】由下文可知他是在一个肉食厂上班。