A、 交流电源系统设计避免同一个电源同时给两个负载供电。
B、 交流电源系统设计防止两个电源同时向同一负载供电。
C、 备用电源系统被设计成避免两个电源同时向同一用户供电。
答案：B
A、 交流电源系统设计避免同一个电源同时给两个负载供电。
B、 交流电源系统设计防止两个电源同时向同一负载供电。
C、 备用电源系统被设计成避免两个电源同时向同一用户供电。
答案：B
A. It is very difficult to determine the effects of corrosion but, as the reports from the CAP inspections are received, the inspection times will be adjusted for any severe problems.
B. It is not easy to decide the affection of corrosion, when the reports from the CAP inspections are received, the inspection duration will be changed for any serious problems.
C. It is very hard to make the decision of the corrosion effects but, if the reports from the CAP inspections are obtained, the inspection times will be arranged in accordance with the severest problem.
A. 扰流板的作用是使机翼上的阻力增加，升力减少,从而扰乱流经该机翼上表面的平滑气流。
B. 扰流板的作用是扰乱流经机翼上表面的平顺气流，从而使此机翼上的阻力增加，升力减少。
C. 扰流板的作用是增加机翼上的阻力，造成升力减少,进一步干扰流经该机翼上表面的光滑气流。
A. The dictionary does not include verbs sorted by trades because there are too many.
B. The dictionary excludes majors because there are too many verbs.
C. The dictionary does not include technical verbs because there are too many.
A. 手册中所示的度量单位必须准确。
B. 手册中的度量单位必须一致。
C. 手册中的度量单位必须写明。
A. 当清洁带有绝缘层的喷管或排气锥时要小心。
B. 当移动带有隔离层的喷管或排气锥时要小心。
C. 当移动带有绝缘层的喷管或排气锥时要小心。
A. 更换油温恒温器控制装置。
B. 更换油温温控器控制。
C. 更换滑油恒温控制器。
A. Many readers have little knowledge of English. Complex sentence structure and the large number of meanings and antonyms that many English words have can cause misconception.
B. Many readers have a limited knowledge of English. Complex sentence structure and the large number of meanings and synonyms that many English words have can cause confusion.
C. Many readers have a little knowledge of English. Complex sentence structure and the large number of meanings and homonyms that many English words have can cause frustration.
A. 机身制造商将适用的部件供应商数据汇入维修手册中，作为“共享信息”的一部分。
B. 机身制造商在维修手册中适当的部分会加入部件制造商提供的“共同利益”数据。
C. 机身制造商将部件制造商提供的“共同感兴趣”的数据汇入维修手册中。
A. Do not refuel the aircraft during maintenance.
B. Do not defuel the aircraft in the period of maintenance.
C. Stop refueling the aircraft before maintenance.
A. 放出适量燃油。
B. 注入大量的滑油。
C. 加入所需量的滑油。
