Airspeeds used in this Section shall be specified in Indicated Airspeed, assuming zero instrument error, in order to make the information as directly usable as possible.
答案解析
解析：
**选项分析：**
**A.** 本节中所规定的各项空速应为指示空速。假设仪表误差为零，尽可能使信息直接可用。
**B.** 本节中使用的空速应在指示空速中规定，假设仪器误差为零，以使信息尽可能直接可用。
**C.** 本节中使用的空速代表指示空速。由于仪表误差为零，所以信息直接可用。
**正确答案：B**
### 详细解析：
1. **术语解释：**
- **指示空速（Indicated Airspeed, IAS）**：这是飞行仪表上直接显示的空速，不考虑仪表误差或其他调整。
- **仪表误差（Instrument Error）**：飞行仪表由于制造缺陷或其他因素导致的读数误差。
2. **选项分析：**
- **选项A**和**选项B**都准确地描述了指示空速的使用和假设（仪表误差为零），但表述方式略有不同。
- **选项A**的说法是“应为指示空速”，虽然意思基本相同，但语法上有些冗余。
- **选项B**的说法是“应在指示空速中规定”，这种说法更加流畅自然，准确表达了空速应以指示空速的形式给出。
- **选项C**虽然也提到指示空速和仪表误差，但“代表”这个词使用不够准确，容易引起歧义。它似乎在暗示空速的“表示方式”与实际情况有关，而不是明确说明空速的规定方式。
3. **为什么选项B是正确的？**
- 选项B用“应在指示空速中规定”这个表述，清晰地指出了空速的使用规范，即所有空速数据都以指示空速形式提供，并假设没有仪表误差，这样可以使得信息直接且易于使用。
### 例子帮助理解：
假设你正在驾驶一架飞机，飞行仪表上显示的空速是120节。这个120节即是指示空速（IAS）。如果飞行手册说明“本节中使用的空速应在指示空速中规定”，这意味着手册中所有相关的空速数据都是基于这个仪表显示的数值，并且假设仪表是准确的，没有误差。这样，你不需要额外调整数据，只需直接使用这些数值即可。
相关知识点：
空速规定及误差假设记准
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