| 释义 |
- abbr.交货前付款（Cash Before Delivery）
- abbr.中央商务区（Central Business District）
短语 - 1
B D C备份域控制器 ; 凯特琳 ; 下忍 ; 天然呆的莱比恩 - 2
- 3
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For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre. 每题都有对应标记的A、B、C和D四个选项，请选择最佳选项并在答题卡2的相应字母中间划横线。 - 2
In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. 在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。 - 3
Three other types of airspace, Classes D, C and B, govern the vicinity of airports. 其他三种领空，D、C 和 B 类，管理着机场周围地区。
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