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- 1将20度时的68克氯化钠饱和溶液蒸发至干,得到晶体18克,求20度时氯化钠的溶解度?
- 2Mary and Hack are going to__next week A.marry B.get married C.get marry D.is married
- 3People didn't have enough food in old ___
- 4I’m ten years old now.用last year替换now改写句子
- 5氧化铁与盐酸反应后 为什么溶液变成黄色 并有无色气泡溢出
- 6There is nothing to worry about.Do you have anything to ---
- 7端字可以换什么偏旁 并组词
- 8小明、小杰两人在周长为400米的环形跑道上散步,若两人同时同地背道而行,则经过2分钟相遇;
- 91.25立方米=()立方分米 450立方分米=()立方米 45立方分米=()立方厘米 8分之5的
- 10已知函数f(x)=sin^2x+根号3sinxcosx+2cos^2x,X属于r