问题
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The opening or closing of the cylinder starting valve is controlled by _____.
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Compensated flow control or constant flow valves are used in hydraulic systems to .A.compe
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Cocks and valves control or interrupt flow, and have internal passages arranged so that th
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Bottom blow valves are installed on auxiliary water-tube boilers to ___________.A.complete
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_____ supplies pilot air to control the cylinder air start valves.A.An air compressorB.An
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Which of the listed pressure control valves would be used to establish the maximum operati
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