The two most common gases used in pneumatic system are （）<br>A:compressed air and nitrogen<br>B:helium and nitrogen<br>C:oxygen and hydrogen<br>D:oxygen and acetylene

The two most common gases used in pneumatic system are （）
A:compressed air and nitrogen
B:helium and nitrogen
C:oxygen and hydrogen
D:oxygen and acetylene

出自：海船船员证

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