下列措施对增大反应速率明显有效的是A.Al在氧气中燃烧生成A12O3，将Al国片

单选题 下列措施对增大反应速率明显有效的是A.Al在氧气中燃烧生成A12O3，将Al国片改成Al粉B.Fe与稀硫酸反应制取H2时，改用浓硫酸C.在K2SO4与BaCl2两溶液反应时，增大压强D.Na与水反应时增大水的用量

A解析试题分析：A、将Al片改成Al粉，增大了反应物的接触面积，所以能使反应速率加快，故A正确；
B、铁和浓硫酸反应生成的是二氧化硫气体，不放氢气，故B错误；
C、K2S04与BaCl2两溶液反应时，增大压强不改变反应速率，压强只针对有气体参与的反应有意义，故C错误；
D、钠和水反应的速率与水的多少无关，故D错误。
故选A。
考点：化学反应速率的影响因素
点评：本题考查学生影响化学反应速率的因素，可以根据所学知识进行回答，难度不大。

德国乐队Groove Coverage 的she、、、~哈哈、、也在学双截棍呐~我也在学、、开始挺难的~~慢慢练！加油！~~

是groove coverage的she 不过这个视频也太搞了...

SHE，德国乐队Groove Coverage演唱的

groove coverage的she、 歌词如下： groove coverage - she lyrics by rummyjulia to my pretty boy~_* she hangs out every day near by the beach havin' a harnican fallin' asleep she looks so sexy when she's walking the sand nobody ever put a ring on her hand swim to the oceanshore fish in the sea she is the story the story is she she sings to the moon and the stars in the sky shining from high above you shouldn't ask why she is the one that you never forget she is the heaven-sent angel you met oh, she must be the reason why god made a girl she is so pretty all over the world she puts the rhythm, the beat in the drum she comes in the morning and the evening she's gone every little hour every second you live trust in eternity that's what she gives she looks like marilyn, walks like suzanne she talks like monica and marianne she wins in everything that she might do and she will respect you forever just you she is the one that you never forget she is the heaven-sent angel you met oh, she must be the reason why god made a girl she is so pretty all over the world she is so pretty all over the world she is so pretty she is like you and me like them like we she is in you and me she is the one that you never forget she is the heaven-sent angel you met oh, she must be the reason why god made a girl she is so pretty all over the world (she is the one) she is the one (that you never forget) that you never forget she is the heaven-sent angel you met she's the reason (oh she must be the reason) why god made a girl she is so pretty all over the world (oh...) na na na na na ... to my pretty boy~_* lyrics by rummyjulia groove coverage - she

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Groove Coverage - She 一首很好听的英文歌~~