一元二次方程怎么解

Do you know the dinosaurs d___ long ago?We shouldn't use p__ shopping bags to store things.French fries and hamburgers are both p__ food. 远征乌桓是何时? 乌桓怎么读 stroll和wander的区别?请不要复制词典的内容!最好给出一些例子来, wander ,stray用法的区别 wander怎么念 wander 什么意思? 小麦的两包面包被偷了?（四字成语） 小麦的两包面偷 四字成语小麦的两包面偷四字成语 英语：积极开展活动,增强自己的能力!把它翻译成英文,跪谢, wander和roam有什么区别? 英语上the的用法 像:在星期一八点钟是怎么说的? 9月最少有几个星期一 financial 孔子老先生所教什么道? After half a year's training,the you were made entirely used( ) underwatera to stayb,to stayingc.stayingd.stay After half a year's training,they were made to be used ________ underwater.A.to stay B.to staying C.staying D.stay After years’ training,the dogs were made completely used ________ in the darkness under fallen buildings to search for the living people.A.to stay \x05B.staying C.stay D.to staying请帮忙分析一下结构好吗 talking to him will get you nowhere,为什么这句话里的talk是分词形式?变成原形不可以吗?RT What a nice model ship (it is)! He decided that she would see if another family in the neighborhood needed a mother's helper.求翻译 历史上的9月7号有什么事情发生,要重大的,多多益善, 求高中历史必修二试题,多多益善 They are completely satisfied.请用英语解释句子 What situation does someone you kown have to stick out?What situation does someone you know have to stick out?这句话怎么翻译? 多多益善的意思是什么? 已知某沿直线运动的指点的运动规律为s=4t(2-t),则它的初速度大小为什么 加速度大小为什 质点M按规律v=3+4t作直线运动,则质点的加速度a= 一质点按规律S=1/2(e^t+sint)作直线运动,求该质点运动的加速度a(t)这个怎么算啊? 求补充从句完从句 求丽旭one fine spring day的链接,要放到空间的背景音乐上, 两个英语疑问（从句什么的）1.The fire was__somebody had dropped a lighted cigarette.A.due to that B.due to because C.due to D.due to the fact that (为什么不直接用due to ,即选C?）2.__by many people at the meeting,the proposal was