单项选择题


A.and
B.but
C.or
D.if
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单项选择题
A.wakeB.tailC.heelD.end
A.wake
B.tail
C.heel
D.end
单项选择题
A.proportionB.equilibrantC.gravitationalD.mechanical
A.proportion
B.equilibrant
C.gravitational
D.mechanical
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