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- 1t℃时,把某物质的不饱和溶液分成甲、乙两份,甲份的质量占3/5,乙份的质量占2/5.在甲份中蒸发M克水或在乙份中加入M克溶质都会成为饱和溶液.t℃时该物质的溶解度为( ) A.100克/100克
- 2I helped my mother cleaned the room yesterday.这句型对吗?
- 3已知矩形ABCD,过A作SA⊥平面AC,再过A作AE⊥SB交SB于E,过E作EF⊥SC交SC于F. (1)求证:AF⊥SC; (2)若平面AEF交SD于G,求证:AG⊥SD.
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- 5已知a-3的绝对值+(b+1)的平方等于0,若2分之1(a-2b-m)的值比2分之一a-b+m的值多一,求m的支
- 6I am going to shanghai next week .Do you have anything __there?
- 7My brother is tall and strong
- 8 定义:a是不为1的有理数
- 9My dog doesn't like eating beef.My cat doesn't like eating beef.(neither……nor)
- 10木炭 活性炭 炭黑 是纯净物吗?