If the cable rubs, it will break after some time.

A. A dash is usually longer than a hyphen but it is sometimes shown as hyphen with a space on each side.

B. A dash is usually longer than a connection symbol but it is sometimes shown as connection symbol with empty on each side.

C. A minus symbol is usually longer than a hyphen but it is sometimes shown as hyphen with a space on each side.

A. Manufacturer determines specific range properly to describe sophisticated and professional information. The information can be put in Maintenance Maunal or other documents.

B. Detailed information on more intricate and specific subjects can be written in two ways: Maintenance Manual or individual documents. The two ways are dependent on manufacturer＇s option properly.

C. It is up to the manufacturer to decide where and to what extent to include detailed information about more sophisticated and professional topics, either in the common Maintenance Manual or in another new documents.

A. 结构类别分为三类：主要的、次要的、备用的。

B. 结构类别分为三类：主要的、次要的、必需的。

C. 结构类别分为三类：主要的、次要的、第三位的。

A. The swivel nuts on both valves engage threads on an internal stem that loosens or draws tight the valve stem to a metal seat.

B. The rotating nuts on both valves are meshed with the threads on the inner valve stud, so that the valve stud is loosened or tightened to a metal valve base.

C. The swing nuts on both valves engage with the threads on the internal spool, allowing the spool to loosen or tighten to the metal seat.

A. The forward movement of the control lever must be slow and continuous.

B. The control lever must be kept moving forward slowly and abruptly.

C. You must continuously slow down the forward movement of the control lever .

A. The Boeing-777 airplanes are different from the previous Boeing series ones mainly in that they are flown by wires.

B. The difference between the Boeing-777 airplanes and the subsequent Boeing series is that they are operated by wires.

C. Fly-by-wire is the main difference between Boeing-777 airplanes and the subsequent Boeing series.

A. 使用听筒侧面的按钮来调节音量。

B. 使用手机旁边的按键来适应体积。

C. 为了加大容量，使用手机侧面的旋钮。

A. Use backthrust to change the direction of the exhaust to achieve contrary thrust.

B. Thrust reverser is used to change the direction of the exhaust gases for reverse thrust.

C. To change the direction of the exhaust nozzle, the thrust reverser is used to obtain the opposite thrust.

A. 确保襟翼和副翼微调手轮已收回并处于零位置。

B. 确保襟翼收起到零位，且副翼配平手轮处于零位。

C. 确保襟翼收上，副翼配平手轮处于零位。

A. 批准的形容词以其基本形式给出，在实际应用的过程中，在括号标注内其最高级和比较级形式。

B. 批准的形容词以其基本形式给出，在适用的情况下，其比较级和最高级形式要标注在括号内。

C. 形容词会以其批准的基本形式给出，在适当的时候，也可给出其比较级和最高级形式。