Put the mask on and breathe through it to make sure that the oxygen supply is correct.

A. 沿四周向内对窗户进行抛光。

B. 以圆周运动方式擦拭窗户。

C. 呈垂直方向给窗户镀膜。

A. In order to obtain additional clearance, gaskets may be added.

B. Additional shims may need to be added to obtain proper clearance.

C. Add special shims as necessary may vary the clearance.

A. 描述飞机螺旋桨时，如果合适，应阐述正桨、反桨和反转。

B. 描述飞机螺旋桨时，如适用，应描述顺桨、解除顺桨和反桨相关信息。

C. 描述飞机螺旋桨时，如果合适，应讨论顺桨、不反桨和反推。

A. 这个程序只能用在自动模式下。

B. 这个程序只适用于模拟方式。

C. 这个程序仅适用于数字模式。

A. Reserve the inflammable material at least 50 inches away from the work area.

B. Deposit the explosive substance out of 50 feet with the work area.

C. Keep flammable materials at a minimum distance of 50 feet from the work area.

A. Metal objects attract magnetic interference.

B. Magnetic interference can occur to the metal objects.

C. Metal objects can cause magnetic interference.

A. 将收发机放到主体组件上。

B. 将发射器放在主体组件上。

C. 将传感器放在主体组件上。

A. The instructions for taxing in bad weather conditions are found in chapter 6.

B. Chapter 6 provides instructions on pulling up in normal weather conditions.

C. Refer to chapter 6 for instructions on how to park in bad weather conditions.

A. If a word is only understood by a very small number of people in a specific technical area, it will cause interference in communication.

B. If a word is only understood by a very small number of people in a specific technical area, it will cause disturbing in negotiations..

C. If a word is only understood by a very small number of people in a special skill area, it will cause interference in communication.

A. 为了简化阅读和相互援引，插图、图形和表格应尽可能以纵向排列布局呈现。

B. 为方便阅读和相互参照，如可行，插图、图形和表格应垂直排列布局。

C. 为了精简阅读和交叉索引，插图、图标和表格如可行，应纵向排列布局。