_________(57)A.pressure B.restraintC.load D.weight

According to the fifth rule, a pressure cooker cover should be opened______ .A．as soon as

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A pressure drop in the liquid line of a refrigeration system may cause________.A.the solen

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57._________A. recipesB. projectsC. receiptsD. in

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57._________A.smallB.hugeC.simpleD.colorful

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57._________A. chooseB. watchC. drawD. recognize

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57._________A. whereB. whatC. thatD. how

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57._________A. birthplacesB. playgroundC. reserve

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