Compressed air is used on board ship for all the following purposes except （）.<br>A:starting diesel engines<br>B:pneumatic control systems<br>C:pneumatic tools<br>D:supercharging air

Compressed air is used on board ship for all the following purposes except （）.
A:starting diesel engines
B:pneumatic control systems
C:pneumatic tools
D:supercharging air

出自：海船船员证

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