escorts+in+shenzhen

邴虞婵2465小学语法知识 比如 be+动词ing等 -
束养璧18796658444 ______[答案] 【小学英语语法知识点汇总】 1.人称代词 主格:I we you she he it they 宾格:me us you her him it them 形容词性物主代词:... +y - y+ ies a story—stories Nouns ending in s,sh,ch or x + es a glass—glasses a watch-watches Nouns ending in o +s or +es ...

邴虞婵2465已知函数f(x)=4sin(π/2+x/2)cos(x/2+π/6)1.求函数f(x)的周期和函数图像对称中心的坐标.2.在△abc中,设内角a.b.c.如果ab=1f(c)=根3+1.且△abc的面积为2分之... -
束养璧18796658444 ______[答案] 1、f(x)=4sin(π/2+x/2)cos(x/2+π/6) =4cos(x/2)[√3/2*cos(x/2)-1/2*sin(x/2)] =2√3*cos²(x/2)-2sin(x/2)cos(x/2) =√3*[2cos²(x/2)-1]-sinx+√3 =√3cosx-sinx+√3 =2(√3/2*cosx-1/2*sinx)+√3 =2cos(x+π/6)+√3 函数f(x)的周期为:T=2π/1=2π 令cos(x+π/6)=0 ...

邴虞婵24651.lots of strange pine trees 短语没错,是抄自书上的,书后面给出pine的意思是松树,但我查了下作“松树”解时是可数名词,那为什么不在pine后加s? 要加在tree后?2.in the north of China,in northern China -
束养璧18796658444 ______ 1.pine tree是一体的,pine和pine tree都是松树的意思,只是个人表达不同,假如你加s在pine后面,就不需要后面的tree了2.in the north of China(在中国北部地区),in northern China(在华北地区)

邴虞婵2465若(4sinα - 2cosα)/(5cosα+3sinα)=10,且α∈( - π/2,0)则cosα值为 -
束养璧18796658444 ______[答案] (4sinα-2cosα)/(5cosα+3sinα)=10 4sinα-2cosα=50cosα+30sinα 52cosα+26sinα=0 2cosα+sinα=0 sinα=-2cosα ------1 cos^2α+sin^2α=1 ------2 解方程组 cosα=√5/5 (α∈(-π/2,0),cosα>0 舍掉cosα=-√5/5 )

邴虞婵2465The book tells of his sister's life in Japan. 为什麽tell要+S? -
束养璧18796658444 ______ book 是第三人称单数,后面动词要变成相应的单数形式,这是英语的主谓一致.常见的句型,The coat costs 100 yuan. 这件外套值一百元.

邴虞婵2465whats+in+your+garden成立吗?为什么
束养璧18796658444 ______ whats+in+your+garden成立吗?为什么 --- What's in your garden? ---- 你的花园里有什么?(表述正确) ---- what's +地点?--- 表示某处有什么? ---- 如; What is on the desk? ---- 桌子上有什么?---- There's a book on it. --- 桌子上有一本书. ---- 能懂了吗?

邴虞婵2465in one's +序数词 和in one's +基数词复数有什么区别.举个例子我不明白 -
束养璧18796658444 ______[答案] in one's+基数词复数 表示在某人几十岁时.in one's +序数词 表示在某人多少岁时.注:基数词复数中基数词为整十的数!

邴虞婵2465fall behind in one's effort 意思+ 分析. 为什么要加个in ,中间的in可以去掉么? -
束养璧18796658444 ______ 不可以 fall behind in是一个词组.意思是在..方面落后

邴虞婵2465to+宾语和to+动词原形有什么区别? -
束养璧18796658444 ______ to do 是去做某事 to sb 是对某人来说怎么样 e.g.She asked me to open the window.她叫我把窗打开. It's important to me.这对我来说很重要.

邴虞婵2465关于名词所有格 名词+of+名词,后一名词为什么有时候要加('s),有时候又不加?例:the girl's name→the name of the girl 女孩的名字 my father's ... -
束养璧18796658444 ______[答案] 这本问题本来我也在纠结,不过现在我搞清楚了,我来回答你.刚看了书,把书上的内容搬过来给你, Double genitive The ... a friend of my brother's some neighbours of my grandparents' Note that the second noun in the double genitive construction ...