每根线由文本和数字组成的编码来识别，由2位字母后跟2位数字构成。

A.Each wire is comprised by an alphabetical code following 2 alpha digits and 2 numerical digits.

B.Each wire is identified by an alphanumerical code comprising 2 alpha digits followed by 2 numerical digits.

C.Each wire consists of an alphanumerical code following 2 alpha digits and 2 numerical digits.

正确答案：B

The surge tank drain check valve also prevents fuel flow from main tank 1 and main tank 2 to the surge tank.

The writing rules cover aspects of grammar and style. The dictionary gives the general words that a writer can use.

The symbol means all or most of the rules in that section.

This index helps you find the applicable STE rules related to different specific subjects.

During the APU operation, examine the oil temperature sensor for signs of oil leakage.

The system must be deactivated in order to prevent the thrust reverser from operating accidentally.

Make sure the girt bar is not engaged in the floor-mounted escape slide brackets.

He removed the access panel to see the corroded tube.

It is a must to check the relevant pump when metal chips are found.

The ignition unit is cooled by the air taken from the fan duct.