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- 3The time and efforts he has devoted during the past few years to __(plant) trees in that village is now considered to be
- 4how much time 有这个用法吗
- 5they are having a great time___in the pool.横线上是填to swimming 还是swimming
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- 7721分光光度计和7230G分光光度计用的比色皿是一样的吗?
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- 9(四)已知集合A={x/x²-3x+2=0},B={x/x²-mx+m-1=0},若A∪B=A.求实数m的值
- 10足球比赛的记分为:胜一场得3分,平一场得1分,负一场得0分,一队打了14场比赛,负5场,共得19分,那么这个队胜了( ) A.3场 B.4场 C.5场 D.6场