Which of the following are true statements?
Result:
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Option 2: "Additional reason for the accident may be the ignoring of standard regulations."
Explanation: The text explicitly mentions that the ignoring of standard regulating procedures caused the plane crash, indicating that this was indeed an additional reason for the accident.
Option 1: "The complicated construction of the plane led to the accident."
Explanation: The text states that the complicated construction of the plane prevented normal controlling, but it does not directly attribute the accident to this factor alone. Therefore, this option misrepresents the cause of the accident.
Option 3: "The engineers did not notice the damage because they were careless."
Explanation: The text does not state that the engineers were careless; it mentions that they did not notice any damages during the engine changes, which does not imply carelessness. Thus, this option is misleading.
Option 4: "Engines are easily controllable."
Explanation: The text implies that the complicated construction of the plane made controlling the engines difficult, contradicting the statement that engines are easily controllable.
Option 5: "The core reason for the accident was the improper controlling of the engines."
Explanation: The text clearly states that the National Transportation Safety Board concluded the accident was due to improper controlling of the engines' serviceability, making this option a true statement.
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