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采取接触隔离的患者若实行床旁隔离，病床间距应大于1米。（）

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微分方程组的平衡点为（） A、(1,2) B、(-1,2) C、(-1,-2) D、(1,-2)

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When mentioning 'the ongoing stock market on Wall Street', the writer ______.A.is calling attention to the privileges to which baby-boomers are entitledB.is calling for the government to take counter measures against labor shortageC.is refuting a notion about experienced workers' early retirementD.is justifying the ineffectiveness of federal tax and benefit policies

A.A.is
B.is
C.is
D.is

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