单项选择题

A.barrier
B.challenge
C.pressure
D.weight
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单项选择题
A.commandB.chargeC.governmentD.state
A.command
B.charge
C.government
D.state
单项选择题
A.reliableB.stableC.durableD.permanent
A.reliable
B.stable
C.durable
D.permanent
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