单项选择题


A.in
B.of
C.for
D.to
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单项选择题
A.variationB.standardizationC.unificationD.transformation
A.variation
B.standardization
C.unification
D.transformation
单项选择题
A.pressB.pressureC.powerD.force
A.press
B.pressure
C.power
D.force
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