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Regularly maintain and inspect marine air conditioning to ensure its normal operation and safety. Split type marine air conditioning - including cleaning air conditioning filters, checking refrigerant leaks, checking electrical connections, etc.

Integrated marine air conditioning - Marine air conditioning systems typically include functions such as cooling, heating, ventilation, and air filtration. Its working principle is similar to traditional air conditioning, which achieves cooling and heating through components such as compressors, condensers, and evaporators.

Fixed pitch propeller - suitable for low-speed blade installation angles that appear too small during high-speed flight; Similarly, the installation angle suitable for high-speed flight may be too large at low speeds.

Aluminum and steel propeller blades for air conditioning large bulk cargo can be made thinner due to their strong material, which is beneficial for improving the efficiency of the propeller at high speeds. After the 1970s, composite materials were still used to manufacture propeller blades to reduce weight.