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. 笔记本电脑有以下主要部件。
B. 笔记本电脑有以下初级部件。
C. 笔记本电脑有以下仿制部件。
A. 使用通用工具密封端口
B. 使用指定的工具封严开口
C. 端口可以使用特殊的工具封严
A. The safety procedures are supplied by the manufacturer.
B. Safety procedures are to be supplied to the manufacturer.
C. Safety procedures are provided for manufacturers to follow.
A. 确保该区域的设备都清空了。
B. 确保该区域的设备都清洁了。
C. 确保该区域那一台设备是完好的。
A. You do not need to give the return processes in its entirety unless you need to comprehend the system.
B. Unless you need to comprehend the system,do not need to fully show the return lines.
C. Return lines need not be shown completely if the system need not be realized.
A. The airworthiness section may recommend each expected replacement time.
B. The replacement time must be set forth in part of airworthiness section
C. Airworthiness section must set forth each mandatory replacement time.
A. Be careful not to get acid on your skin.
B. Do not get acid on your skin.
C. You must be careful to get acid on your skin.
A. There may be much deficiencies in describing the steps for a job.
B. Describing the steps is a job that may leave much to be desired.
C. Operation the steps is a job that may be leave much to desired.
A. Do not authorize to do the engine test.
B. The engine test will not be completed if you are not authorized.
C. If you are not approved to do this work, do not do this engine test.
A. 设备对没有列出的飞机的重量或平衡没有显著影响。
B. 对飞机重量或平衡没有显著影响的设备不需要列出。
C. 没有明显影响的设备的重量或平衡在没有列出的飞机上。
