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Console.log ("Baidu's human resources are too weak, I am waiting for flowers are thanks! ! ");Civil aviation pilots are the main force in the civil aviation industry. The clothes of civil aviation pilots are white shirts in summer and black suits in winter. The colors are basically uniform all over the world, but the styles are formulated by various companies, and each company is not the same. Civil aviation pilots are roughly divided into two grades: the captain and the co-pilot, but the captain and the co-pilot are divided into many grades. The co-pilot is generally divided into the first-stage co-pilot (F1), the second-stage co-pilot (F2), the third-stage co-pilot (F3), the fourth-stage co-pilot (F4) and the left-seat co-pilot (FL). The captain is divided into the captain, the teacher, the inspector, etc.An event can be active (open) or stopped (closed). Active means that the event scheduler checks whether the event action must be called. Stopping means that the declaration of the event is stored in the directory, but the scheduler does not check whether it should be called. After an event is created, it becomes active immediately, and an active event can be executed once or more times.2.1. 3 Design requirements for the direction of travel of the PCB/duck3. Bold, careful and thick-skinnedThat's horrible! ! ! ! ! It's really terrible! ! ! ! ! !