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疫情期间,武汉等几个城市建立方舱医院对患者集中隔离治疗,有效遏制了疫情的传播,此举属于预防传染病的哪个措施( )
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The music played by Lang Lang _____ very pleasing to the ear.
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将参数方程x=(2-3t)/(1+t),(t为参数)化为普通方程,它表示的图形是: { y=(1+4t)/(1+t)
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函数f(x)=x(三次)+sinx+1 x属于全体实数. 若f(a)=2,则f(-a)的值为?
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