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(1) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced.
(2) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency.
Regarding the above statements,
| | A) only No. 2 is true. |
| | B) only No. 1 is true. |
| | C) both No. 1 and No. 2 are true. |
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