机会靠自己创造

up to now只能与现在完成时连用吗?Up to now I have been reading this book.这个句子对么? Many trees ___(plant) in our school yard these years.1.have been planted 2.are planted选哪个?为什么? 交流设备误接入直流电源的后果?会造成设备的烧坏吗? 还是只是设备无法启动进行工作?如果是反过来是直流设备误接入交流电源的后果呢?希望各位前辈对两种情况给予解答!谢谢.我想强调两 where/if it comes to the point 用直流电源制作0-1A交流电流发生器, 请介绍如何解决220伏交流电源变成负48伏直流电源?（为交换机-48v供电）交换机功率约60W,估计2A输出可以满足.最好提供销售商联系方式.谢谢! 27．图14是我国某地区地形等高线及某时刻海平面等压线图.读图回答下列问题.(1)此时,A城镇风向是 .A与D相比,晴天概率大的是 ,原因是 .西南风 A A地位于冷锋锋前我的问题是：第三个空 怎么看 Fe2(SO4)3与NaOH反应如能写出化学方程式 Fe和Fe2(SO4)3的反应Fe和Fe2(SO4)3会反应吗?如果会,会生成什么? KSCN检验FE2+为什么Fe(OH)2会马上被氧化成Fe(OH)3,但FeCl2中加KSCN先是没现象的 Na2SO3和Fe2(SO4)3反应方程式. The one with dark brown hair 这里为什么用 with 不用 has The turnkey was twenty stone of gross stupidity,with brown rotting teeth and small dark eyes.谁能给我翻译一下这句话, So up to this point. theres no point to this... 问一句话怎么理解13个自然数的平均数是12.43,最后一位数是错的,是由于此和不是13的整数倍,因而平均数是小数,又由于平均数精确到小点后最后一位数,所以13个自然数之和必大于12.39的13倍,而 请教一句话的理解While speakers may vary in their own speech across dialect boundaries,often subconsciously,they were easily aware of slight differences in the speech of others.【A form of linguistic prejudice emerges in that groups may arbit 图中为浙江沿海地区某区域示意图,读图回答下列问题 （1）图中所示地区气候类型是--------气候；典型的地带典型的地带性土壤是---------------壤.在农业土地利用方面,北部100米以上宜种植经济 询问UCLA申请要求中的一句话的意思.UCLA的申请要求中An international student whose post-secondary education is completed outside of the U.S. is expected to hold a degree representing completion of at least four years of study with ab 英语提问：一下一句话的时态不理解,When the fire broke out in the basement,he had gone down to investigate immediately.（这是一则新闻报导里的一句话）当地下室发生突发大火时,他立刻前去查看.这句话火灾 兄弟们帮帮忙啊,来篇超简短外语作文外语老师叫交一篇外语邮件,不限类容,简短就好,我外语他差帮帮忙,老是：女,姓：程,比较温和,上课也很活跃（大二的上课方式也多）,我们换了3个外语老 the,were,no,buses,in,past,there,airconditioned.连词成句 用short,mother,hair,with,dark,her,is连词成句 请教粉石英选矿知识,含量在99以上的粉石英精矿可以做哪些产品,能应用在哪些领域?请问什么标准数据的粉石英矿算好矿?粉石英目前应用领域最大的是哪几个方面? 求一女生英文名 中文名字为 书乐起的谐音最好差不多 Everyone needs ____（have）at least eight hours' sleep a night.有讲解 合成下列物质需要供给氮院的是：糖原/脂肪/核酸/淀粉 they were amazed to find that the goddess turned out to be a very morden looking momanamzed是 形容词 to find that the goddess turned out to be a very morden looking moman在句中是什么什么成分 they were amazed to find that the goddess turned out to be a very modern looking woman1 这句话的they were amazed to find 是被动语态吗?还是说amazed是形容词?2 the goddess turned out to be a very modern looking woman 这里为什么要 they were amazed to find that the goddess turned out to be a very morden looking moman 是宾语从句么 they were amazed to find that the goddess turned out to be a very morden looking woman为什么是turned out to be 为什么加个be .直接写成turned out to a very morden looking woman.错在哪里 One e___two young men were walking in the street together.They tried to find a c____to steal somethThe clock struck twelve.Most of the people went to bed.Quickly they came to a house and it seemedthat everyone in the house had falled a___.Standing at