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科目:高中数学 来源: 题型:
| A、|AB|>|CD| | B、|AB|<|CD| | C、|AB|≤|CD| | D、|AB|≥|CD| |
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科目:高中数学 来源: 题型:
| A、(2,2,-8) | B、(1,1,-4) | C、(-2,-2,8) | D、(-1,-1,4) |
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