单项选择题

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

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单项选择题

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C.List of Private Aids
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单项选择题

A.radio time signal
B.comparison with a timepiece of known error
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