万科、联想、海尔这几个在中国风云驰骋的企业都诞生在1984年。这一年，中国出现了第一次“下海经商”浪潮。上述现象出现的原

D

因为光线是一来一回走了两倍的路程.所以镜子移动半个波长,光线路程改变一个波长也就是一个周期

1 Sea pleased famous family; 2 Long Ge; 3 Beijing reaches the international apartment; 4 Lishui fine garden; 5 Observes the lake international; 6 Sails the sea international; 7 Wan Kedong;8 Brocade Xiu garden; 9 Rich strength Edinburgh; 10 Cercis chinensis bold courtyard; 11 Park main road; 12 Ten thousand reach the apartment; 13 Golden international garden; 14 Chinese trade center; 15 Open sea world; 16 East area international apartment; 17 East permanent time; 18 East Run scenery; 19 Rich strength city; 20 Loves the date homeland; 21 China industry rose county; 22 Peaceful Chinese Bin River park; 23 Various place names homeland; 24 Easy to buy the space; 25 Latter modern city; 26 Apple community; 27 Becomes happily international; 28 Brilliance international apartment; 29 World trade international apartment; 30 Triumphant peaceful international; 31 Eastern auspicious scenery; 32 Ten thousand bold apartments; 33 Crystal international; 34 Scenery line; 35 Blue fort; 36 The blue lake occupies; 37 Sea pleased famous family; 38 Magnificent Shui An; 39 New town international; 40Harbor international.

解题思路：含有碳元素的化合物叫有机化合物，简称有机物．碳的氧化物、碳酸盐、碳酸虽含碳，但其性质与无机物类似，因此把它们看作无机物，根据摩尔质量的计算方法回答本题．

甲醛（CH₂O）中含有碳元素，属于有机物；甲醛的摩尔质量是：12+1×2+16=30（g/mol），由于1mol物质的个数是6.02×10²³，0.5mol甲醛中含有氢原子个数：0.5mol×2=1mol，所以个数为：6.02×10²³
故答案为：有机物；30g/mol；6.02×10²³；

点评：
本题考点： 有机物与无机物的区别；有关化学式的计算和推断．

考点点评： 解答本题的关键是要知道有机物的判断方法，摩尔质量的计算方法和原子个数与物质的量的关系．

D

A“回拢”应为“回笼”；B“谐奏曲”应为“协奏曲”；C“依重”应为“倚重”。

因为2万是20000,你把它除过去,得到(1-x)^2=2/5,再开方求解就可以了

甲醛（CH ₂ O）中含有碳元素，属于有机物；甲醛的摩尔质量是：12+1×2+16=30（g/mol），由于1mol物质的个数是6.02×10 ²³ ，0.5mol甲醛中含有氢原子个数：0.5mol×2=1mol，所以个数为：6.02×10 ²³
故答案为：有机物；30g/mol；6.02×10 ²³ ；

Building xx,Phase 2,Vanke Qianlinshanju,Longgang District,Shenzhen,Guangdong Province xxxxxx(邮政编码) P.R.China

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