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The characteristics of the selected materials are the primary design considerations. The cylinder head cover is mostly made of thermoplastic, and its characteristics will change with the environment. The use of reinforcing materials can reduce the impact of environmental changes, but this impact will still occur to a certain extent. The important environmental factor is the temperature. When the temperature rises, the strength of the material will decrease. The other two environmental factors are aging and contact with engine oil, which will weaken the properties of materials.
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