单项选择题
A.feedback
B.governor
C.steam
D.system
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单项选择题
A.givesB.meansC.allowsD.forbids
A.gives
B.means
C.allows
D.forbids
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单项选择题
A.constantB.quietC.calmD.noisy
A.constant
B.quiet
C.calm
D.noisy
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