1715. 字母数字标识符是标识某物的字母和数字的组合。

An alphanumeric identifier is an assembly of characters and numbers. It can recognize something.

An symbolic-numeric identifier is an assembly of symbols and numbers. It can identifies something.

An alphanumeric identifier is a combination of letters and numbers that identifies something.

正确答案：C

设备系统操作理论翻译

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1648. 在夜间操作期间,确认面板上的灯是暗亮的。

1647. WHEN THE TEMPERATURE OF THE VENTILATION AIR ( ) TO 27 °C, THE DISCHARGE VALVE OPENS

1646. MAKE SURE THAT THE CAPTAIN＇S BOOMSET ( )SIGNALS CORRECTLY

1645. THE BATTERIES ( ) 28 VDC

1644. This tool is used to align the mark on the cable tension regulator with the related graduation on the fixed scale

1643. Stir the bonding material wtih a spatula

1642. Correct the tension

1641. 设置开关到打开位。

1640. When you lift or lower the aircraft, you must keep the level attitude

1639. Class D fire is a fire in which a metal such as magnesium burns