Clean air standards referred to as “Grade D” apply to compressed air for use in（）.<br>A:high pressure fluid accumulators<br>B:driving air-powered plunger pumps<br>C:filling open-circuit breathing systems<br>D:bladder-type accumulators

Clean air standards referred to as “Grade D” apply to compressed air for use in（）.
A:high pressure fluid accumulators
B:driving air-powered plunger pumps
C:filling open-circuit breathing systems
D:bladder-type accumulators

出自：海船船员证

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