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答案选A
2011-06-06 20:16 来自版块 -
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答案选C
2011-06-06 20:15 来自版块 -
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答案选A
2011-06-06 20:13 来自版块 -
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3)已知A的某种同分异构体N具有如下性质：①N与FeCl3溶液反应，溶液呈紫色②N在一定条件下可发生银镜反应，N与H2在苯环侧链上按照物质的量之比1∶1作用后的生成物不能发生消去反应③在通常情况下，1 mol N能与含1 mol Br2的浓溴水发生取代反应④N分子中苯环上的取代基... 全文
2011-06-05 12:53 来自版块 -
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答案(1)Na2co3 Ba(OH)2(2)b(3)硝酸根最后一个问是 c(Na+)>c(碳酸根)>C(氢氧根)>C(碳酸氢根)>C(氢离子)请老师推理
2011-06-05 12:48 来自版块 -
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下列条件下,两种气体的分子数一定不相符的是D,相同压强,相同体积,相同质量的NO2和N2O4请老师解释它为什么对
2011-06-05 12:01 来自版块 -
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~Would you like to read some news about the football game,Jane?~__.I feel like doing someting else.A,not likely B,no problem C,not r... 全文
2011-06-04 18:39 来自版块 -
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答案是N1/N
2011-06-03 19:02 来自版块 -
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答案是60度
2011-06-03 19:01 来自版块 -
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答案为B
2011-06-03 18:58 来自版块 -
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答案为C
2011-06-03 18:57 来自版块 -
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答案为B
2011-06-03 18:56 来自版块 -
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答案选C
2011-06-03 18:54 来自版块 -
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（6）某种种子每粒发芽的概率都为0.9，现播种了1000粒 ，对于没有发芽的种子，每粒需再补种2粒，补种的种子数记为X，则X的数学期望为（A）100 （B）200 （C）300 （D）400答案选B
2011-06-03 18:52 来自版块 -
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Scientists have developed a technique ___ could help solve crimes by using hair to figure out where a person has been .A,when B,who c,w... 全文
2011-06-02 21:02 来自版块 -
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Today it is widely __ that examinations should not be the only way to judge a student .A,believed B,to believe C,believing D,being be... 全文
2011-06-02 21:00 来自版块 -
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I`m afraid it won`t be long ___ you learn that having a good attitude is half the battle.A,while B,before C,after D,s... 全文
2011-06-02 20:58 来自版块 -
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答案选B请老师解释
2011-06-02 20:52 来自版块 -
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答案选D
2011-06-02 20:42 来自版块 -
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次数12345678910A0.450.450.440.450.550.550.520.500.460.45B0.310.310.310.300.300.600.620.380.330.32C0.230.230.230.230.180.170.160.220.230.23某科研小... 全文
2011-06-01 22:43 来自版块 -
