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【判断题】
向量λa的模等于向量a的模的λ倍.A.
正确
B.
错误
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【单选题】There is no doubt about it: the Earth really is growing warmer. If you live in a city, that is, 【C1】______ have known for years that swaths of asphalt and concrete tend to【C2】______ the summer he...
A.
population
B.
citizens
C.
dwellers
D.
people
【单选题】Researchers investigating brain size and mental ability say their work offers evidence that education protects the mind from the brain's physical deterioration. It is known that the brain shrinks as t...
A.
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B.
education
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health
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【单选题】关于子宫复旧错误的描述
A.
产后2~3d宫颈口可容2指
B.
产后4周宫颈完全恢复正常形态
C.
子宫4周恢复至非孕期大小
D.
子宫重量约为50g
E.
产后10d子宫降至骨盆腔内
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