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• 小学英语假期作业 六年级1.就括号部分提问.1.He was (50 kg).2.Sally is (165 cm tall).3.It is (28 km) from Luo Hu to Nan Shan.4.I played badminton (twice a week).5.Di Wang Builing is (more than 120 metres hight).6.He lives in Shen Zhen (for 15 years).7.There are (56) peoples in China.8.There is (a bottle of) water in the fridge.如果回答得好,我可以加奖赏.如果谁做完了这本,一模一样的,有闲空时间的,可以发一些答案出来,但是要注明第几页.谢谢!我一定会加大奖赏的!
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• 希望能帮我!括号部分提问（1）He was (50kg) .(2)Sally is (165cm tall).(3)It is (28km) from Luo Hu to Nan Shan.(4)I played badminton (twice a week)(5)Di WANG Building is (more than 120 metres hight)(6)He lives ni Shen Zhen (for 15years).(7)There are (56) peoples in China.(8)There is (a bottle of) water in the fridge.
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• 叠氮化钠（NaN3）被广泛应用于汽车安全气囊，某兴趣小组对其进行下列研究．应用研究：（1）汽车经撞击后，30毫秒内引发NaN3，迅速分解为Na、N2，反应方程式为______．制备研究：（2）将金属钠与液态氨反应得NaNH2，再将NaNH2与N2O反应可生成NaN3、NaOH和气体X，该反应的化学方程式为2NaNH2+N2O=NaN3+NaOH+X，实验室检验X气体使用的试纸是湿润的______．Na2CO3质量分数测定：工业级NaN3中常含有少量的Na2CO3，为测定样品中Na2CO3的质量分数设计如图装置（已知H2SO4溶液与NaN3，反应不生成气体）．（3）装置A的作用是______．设计的实验步骤为：①精确称量样品，检查装置气密性；②打开弹簧夹，鼓入空气，称量装置C；③关闭弹簧夹，打开分液漏斗活塞；④再打开弹簧夹，______；⑤再次称量装置C．计算碳酸钠含量至少需要测定______（填数字）个数据．根据制备反应，分析工业级NaN3中含有Na2CO3的可能原因______．NaN3纯度测定
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