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铝合金 碳合金 钛合金 钢哪个结实登上杖 3D打印能够打印的铝合金有哪些? 有哪些3D打印机能够打印铝合金? Mother is drinking a bottle of water now.对 a bottle of 提问 We must have been drunk last might,_________?A 为什么不对啊A.weren't we B.mustn't we C.hadn't we D.didn't weA 为什么不对啊 用所给词的适当形式填空The younger people should be （）[rude] to the old 有没有unrude这种啊没有的话用啥、 朱江三角洲地区城镇化发展迅速的直接原因是 军事里的三角洲和地理里的三角洲是什么?有什么联系? What does the signs mean.这句话哪错了 What does the signs mean? 改错只能改does 、signs、mean三处中的一处. 是把does改成do吗? the是代表后面的是单数吗?那是把signs改成sign吗? 求解! the lost city 攻略不需要了 You should speak to the old politely.The old____ ____ ___ ____politely. ⒈If you _ (help) others in difficulties,you _ happy. ⒉We _ (go) have a picnic if it _ (not rain) tomorrow.⒊- _ you _ (do) some shopping tomorrow. -Yes,I will. he is happy---------- (help)people children should speak politely to old people 改为反义疑问句 You should speak to the old man politely.(对 politely提问）_____ should you _____ _____ the old man? 以my favourite animal 为题,用30字左右的词写写你最喜欢的一个动物.比如说它是什么颜色的、长的什么样、喜欢什么、能做什么等等. 请翻译:You might have given him more help,though you were busy.如题 Good,evening写出应答语 圈形容一个人是什么意思 初二英语作文 an interesting thing是初二的 .不要太难.90词左右 要用过去式 In the evening school where I study computer______. A is there B has many people C is well taught D is nice为什么选C,而不选其他? 求Lady gaga的Nothing On (But The Radio)的歌词RT.求牛人解答.不要跟我说不是Gaga唱的、就算不是我也想要歌词. when crossing street,you must be careful这句话,前后主语相同,前面的when是不是也要省啊 The boy _carefully but _nothing.The boy _carefully but _nothing .A listens;heard B heard;listened to C listened;heard of D listend;heard 双水解反应适用的范围? 双水解反应在什么情况下可以进行到底?我知道 铝离子与碳酸氢根能双水解,因为生成的 氢氧化铝 二氧化碳 可以脱离反应体系,所以可以进行到底.那为什么 铵根与醋酸根反应 生成 醋酸 氨气 英语 Fine,thanks.Andyou?怎么念 I __ very carefully,but I can ____ nothing.A,see ,B,watch C,look D,read 为什么 张骞出使西域后,开通了一条______向西,经中亚、西亚、直达____洲的交通大道,丝绸之路沟通了____两大洲 张骞出使西域的出使是什么意思? 张骞出使西域有哪些贡献