The listed terms are parts of a cell. Match each term with its correct meaning. cell membrane DNA mitochondria chromosomes endoplasmic reticulum nucleus cytoplasm genes 2. regions of DNA within each chromosome
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【单选题】设向量 a , b , c 满足 a + b + c = 0 ,且 a ⊥ b ,| a |=1,| b |=2,则| c | 2 = [ ]
【简答题】(1)设a,b>0,且2a+b=1,设 T=2 ab - a 2 - b 2 ,则当a=______且b=______时,T max =______. (2)设a,b>0,且2a+b=1,设 T=2 ab -4 a 2 - b 2 ,则当a=______且b=______时,T max =______.