The port state control officer may witness a fire drill carried out by the crew assigned to these duties on the ____.

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The port state control officer may witness a fire drill carried out by the crew assigned to these duties on the ____.

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Usually, the hydraulic fluid flows into the valve through port a and out through port b.

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_____ is the state church in England.

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The static port is used to measure _______ ．

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Of the fifty states，the smallest state in America is( )

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