设z=f(x,y)满足dz=(x2y-2)dx(xy²-2)dy

It is p__ for us to finish the work before 5 o'clock Restore Defaults 的中文意思是怎么啊 ：我按了Restore Defaults,现在不知怎么弄我进入BIOS.按了一个选项,然后就有问题了,一到滚动条那里闪了一下蓝屏又重启了,一直这样,然后用PE进入,发现盘都不见了,PE原来自带的软件也没了,但是 （Load Optimized Defaults ） restore defaults是什么意思 BIOS设置里的LOAD Fail-Safe Load Optimized defaults 这两者有什么区别啊? People plant hundreds of trees every year 改为被动语态 高中英语选择：The manager demanded that the work ____ by the end of the month.A.must finish B.would be finished C.be finished D.must be finish 将下列句子改为被动语态.We must water the flowers. People cut down a lot of trees every year.He cleaned his bedroom just now.The teacher won't open the window.Mary has forgotten the book. 1 Every year,people who <> here cut down a lot of trees.A.worked B.made2.but they didn't any young trees.A.care B.plant C.build D.bring 3.The next year,all the people who lived in the village planted many trees.Soon the trees grew up.People pro We cut down and burn billions of trees every year but we replace hardly any of them.中文翻译 She is my moter ..(根据答句写问句) My aunt works in a bank根据答句写问句 冰箱里面的off和on开关是什么作用?123456又是什么作用? 冰箱温控旋钮下边有个灯开关,再下面还有一个ON或OFF开关是干嘛用的? 英文翻译 西班牙 英语翻译the country in the 18th centurt. 英语翻译SOS Would you agree money doesn't mean happiness? people____Paris the City of Lights 这句中除填called 还可填什么?在 say talk make 三个中有适合的吗 We can buy a lot of things with __,but it doesn't always bring happiness."__"填什么好人一生平安 How do you like our city用英语解释句子 We can buy lots of things with (m ---),but it doesn't always bring us happiness 用英语解释句子2.Our city changes a lot now. 英语单项The project______ by the end of 2004 has benefited 100,000 people in the city.The project______ by the end of 2004 has benefited 100,000 people in the city.A.completed B.having been completed 欧巴 啥意思 The city is well-knows for its modern buildings用英文解释句子是用英文解释句子。就是写同义句 江南style 欧巴嘎纳萨 Gangnam 欧巴啥意思 gangnam style中文什么意思 million的用法,最好全一点 million 的语法用法例子