6. For merchant propulsion turbines，the _______ of about 28.5 inches Hg has widely accepted as the design basis.
(A) length
(B) vacuum
(C) temperature
(D) height

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統計： A(298), B(618), C(119), D(175), E(0) #2197226

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6.對於商用推進渦輪機，約28.5英寸汞...
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