Research on the safety of construction and manufacturing shows that when the workload of an enterprise increases, the injury rate also increases. When the workload increases, the company always employs a large number of unskilled workers. There is no doubt that the increase in the injury rate Caused by inefficiency of unskilled workers. which is the strongest refutation of the above point? ['When the load increases, the company hires unskilled workers for temporary work only.', 'Injuries in construction are higher than in manufacturing.', 'As long as the workload of the company increases, the accident rate of skilled workers will always increase.', 'Companies that need to hire new people should strengthen vocational training.']