单项选择题
A.appliance
B.machinery
C.utility
D.facility
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单项选择题
A.easyB.singleC.simpleD.similar
A.easy
B.single
C.simple
D.similar
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单项选择题
A.saveB.preserveC.raiseD.retain
A.save
B.preserve
C.raise
D.retain
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