从含盐16%的40千克盐水中蒸去部分水分,制成含盐20%的盐水,则应蒸去水:A.8千克 B.9千克 C.10千克 D.11千克

从含盐16%的40千克盐水中蒸去部分水分,制成含盐20%的盐水,则应蒸去水:A.8千克 B.9千克 C.10千克 D.11千克

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-How about your trip to Hainan?--It couldn't have been ______. Sometimes I...

-How about your trip to Hainan?--It couldn't have been ______. Sometimes I...

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Tom's mother always told him not to smoke again, but ______ didn't help.

Tom's mother always told him not to smoke again, but ______ didn't help.

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--Can I get the house cheaper?--Sorry, it's ______ my power to sell it any...

--Can I get the house cheaper?--Sorry, it's ______ my power to sell it any...

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关于维生素的描述,下列错误的是()。A.维生素对预防某些疾病发生有不可替代的作用 B.过量服用维生素有可能增加一些不必要的健康风险 C.孕妇、乳母和幼儿对维生素

关于维生素的描述,下列错误的是()。A.维生素对预防某些疾病发生有不可替代的作用 B.过量服用维生素有可能增加一些不必要的健康风险 C.孕妇、乳母和幼儿对维生素

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