2158.The pressure lines divide in different directions.

A. The space equipment releases the air from the compound.

B. The vacuum equipment decreases the air from the compound.

C. The vacuum equipment removes the air from the compound.

A. 字母数字索引的主题应包含在简介中,作为定位所需电路的辅助手段。

B. 简介中应包含按主题排列的字母索引,以帮助定位所需的电路。

C. 简介中应包含数字索引的主题,以帮助确定所需的电路。

A. 改版是指对现有数据进行更新。

B. 手册修订是指对其内容进行升级更新。

C. 修订是指对现有手册中信息的修改。

A. 没有人允许接近飞机做功能测试。

B. 不允许任何人进入飞机做功能测试。

C. 在做功能测试期间,任何人不得接近飞机。

A. 如果没有明显迹象表明紧固件松动,在紧固件头部和相邻材料上标记一条红线。

B. 如果紧固件松动的迹象不清晰,则跨过紧固件头部在相邻材料上标记一条红线。

C. 如果没有清晰地显示出紧固件松动,则在紧固件头部和相邻材料的上方标记一条红线。

A. 长的复合句可以通过垂直列表简化以便理解。

B. 垂直方向的清单使复杂的长句子更容易理解。

C. 垂直列表使复杂的长句子更容易理解。

A. This system is used to expand and return the landing gear.

B. This system is used to extend and retract the landing gear.

C. This system is used to extract and retract the landing gear.

A. Make sure the probe cover is in good working condition with no evidence of damage.

B. Make sure the probe plug is in good condition and there is no signal of damage.

C. The probe lid is insured to be in ideal condition and out of damage.

A. 在两个垫圈之间安装间隔装置。

B. 在两个清洗器之间安装垫片。

C. 在两个垫圈之间安装垫片。

A. One of the safety precautions is to keep the combustible material from the work area at distance of 50ft at least.

B. One of the safety precautions is to keep the flammable material from the work area at distance of 50ft at least.

C. One of the safety precautions is to keep the combustible material from the work area at a minimum distance of 50ft.