at+a+high+temperature

邹标维5213有别的be +adj+doing形式的词组吗? -
巴呢韦15567401903 ______ 有太多. be careful walking on ice. be careless solving the math pro blem be helpful making the task easy 之所以形容词后加动名因中间可省略连词或介词,如这里的when,in 等等.

邹标维5213是at a high voice 还是 in a high voice 还是其他 -
巴呢韦15567401903 ______ in a high voice 高声地 He announced the news in a high voice. 他以高昂的声音宣读了那个消息.

邹标维5213She wants to buy shirts at a good price. 请问这里的介词为什么用at? 可以用 with吗? -
巴呢韦15567401903 ______ at a price of;以多少价格 at a good (high, low) price 以好价钱(高价,低价)(买进或卖出) 这些都是习惯用法.这类句子格式不能用 with. with 用在购物时,需要具体的数目. 例如:he bought a textbook with 2 dollors, 他用两美元买了本教材.

邹标维5213at the top of 和on the top of 的区别? -
巴呢韦15567401903 ______ 1.at the top of =on (the) top of...在......顶上 The village is perched on (the)top of / at the top of a high hill. 村子坐落于一个高山顶上. 2. on top of...: 除…之外; 接着 Gale winds came on top of the floods.大风紧接着洪水袭来. He lost his job and on top of that his wife left him.他失业了, 不仅如此, 他妻子也离开了他.

邹标维5213已知矩阵A满足A^2 - 2A+E=0,则e^(At)=------------ -
巴呢韦15567401903 ______ A^2-2A+E=0得到(A-E)(A-E)=0,从而A=E.所以e^(At)=E+At+(At)^2/2!+(At)^3/3!+...=E+tE+t^2*E/2!+t^3*E/3!+...=e^t*E

邹标维5213根据汉语意思即所给提示词语,将下列句子翻译成英语.用高温把它煮20分钟.(at a very high temperature -
巴呢韦15567401903 ______ Boil it at a very high temperature for 20 minutes.

邹标维5213sell sth. at a high price有这么个短语吗 -
巴呢韦15567401903 ______ 不能说它是一个短语,只能说 at a high / low price 是固定表达,即与 price 搭配的介词用 at .

邹标维5213小弟请教个问题:设A是n阶实对称矩阵,则当t充分大时,A+tE为正定矩阵. -
巴呢韦15567401903 ______[答案] 实对称矩阵必有实特征根 设A的特征根组成的对角矩阵为M 则A=P^(-1)*M*P A+tE=P^(-1)*(M+tE)*P 当t充分大时,A+tE的特征根全为正值 于是A+tE为正定矩阵

邹标维5213at high/ top /full / low /ordinary speed和with great/ all speed的形容词能互换吗? -
巴呢韦15567401903 ______ at +adj. +speed 以一种..速度,中间多用程度类的词 特殊:speed被all, lightning, great等修饰时,介词应用with ```````````````````````````````````````` 答案有帮助还望及时采纳、谢谢、 祝学习进步、