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8391
(1) Relief valves are used in pneumatic systems as damage preventing units.
(2) Check valves are used in both hydraulic and pneumatic systems.
Regarding the above statements,
| | A) only No. 1 is true. |
| | B) neither No. 1 nor No. 2 is true. |
| | C) both No. 1 and No. 2 are true. |
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