下列说法不正确的有( )

下列说法不正确的有( )A.防火门、窗应划分为甲、乙、丙三级,其中甲级耐火极限为1.2小时;乙级耐火极限为0.9小时、丙级耐火极限为0.3小时 B.开关

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David Birch claims that he only hires liberal-arts people be

David Birch claims that he only hires liberal-arts people because ________.A.the

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人体内O2、CO2进出细胞膜是通过(  )

人体内O2、CO2进出细胞膜是通过(  )A.单纯扩散 B.易化扩散 C.主动转运 D.人胞作用 E.出胞作用

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The bride and groom promised to (  ) each other through sick

The bride and groom promised to (  ) each other through sickness and health.A.no

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Planned Grandparenthood would include depressed grandparents

Planned Grandparenthood would include depressed grandparents on its staff in ord

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