Units of measurements shown in manual must be consistent where practical.
答案解析
解析：
首先，我们来分析题干的内容：
1. **Units of measurements**：指的是测量单位，比如米、千克、升等。
2. **shown in manual**：指的是在手册中展示的内容。
3. **must be consistent**：意味着这些测量单位必须保持一致。
4. **where practical**：表示在实际可行的情况下。
综合来看，这句话的意思是：在手册中展示的测量单位应该尽量保持一致，前提是这样做是可行的。
接下来，我们来逐一分析选项：
- **A. 如果可行的话，手册中出现的计量单位应该保持一致。**
- 这个选项直接翻译了题干的意思，强调了“可行”的条件，符合题干的要求。
- **B. 实际上，手册中出现的测量值必须保持一致。**
- 这个选项的“实际上”与题干的“where practical”不完全对应，且“测量值”与“计量单位”并不是同一个概念。
- **C. 手册使用的计量单位必须与实际情况保持一致。**
- 这个选项强调了“与实际情况保持一致”，而不是强调“保持一致”的重要性，且没有提到“可行”的条件。
通过以上分析，我们可以得出结论，选项A最符合题干的意思，因此是正确答案。
### 深入理解
为了帮助你更好地理解这个知识点，我们可以用一个生动的例子来说明。
想象一下，你正在编写一本关于烹饪的手册。在这本手册中，你需要使用不同的计量单位来描述食材的用量，比如“1杯糖”、“200克面粉”等。如果你在手册的不同部分使用了不同的计量单位，比如有的地方用“杯”，有的地方用“克”，这可能会让读者感到困惑，尤其是对于那些不熟悉这些单位的人。
因此，保持计量单位的一致性是非常重要的。假设你决定在所有地方都使用“克”作为计量单位，这样读者在阅读时就不会产生混淆，能够更容易地理解和执行食谱。
然而，有时候可能会遇到一些实际情况，比如某些食谱在国际上更常用“杯”作为单位，这时你可以选择在手册中同时提供两种单位，但要确保在同一食谱中保持一致性。
相关知识点：
手册单位可行处要一致
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