like动词三单形式

小玉早晨8-00 出发,中午12-30 到家,小玉出发时和到家时,时针和分针的夹角分别是 多少度和多少度,夹角的度数取大于0 度且小于180度. 什么是便利样本?convenience sample是不是非概率抽样的样本? 什么叫保留样本holdout sample 统计概率样本偏差relevant/irrelevant features in sample selection bias希望得到一些关于sample selection bias的讲解,但是是关于relevant/irrelevant features,大概就是irrelevant features会让结果特别趋向0或者特别趋向 统计学里的sample和population有什么区别啊,他们的定义分别是什么呢?求他们的平均数不都是加起来除以总数量吗,为什么一个用x拔表示,一个用miu 表示呢? 已知椭圆的中心在坐标原点,焦点在x轴,椭圆焦距为4,且离心率为更号2分之2,求椭圆标准方程 一轮船在甲、乙两地间航行,顺流4小时,逆流6小时,求轮船速度是水流速度的几倍 一道英语改错题,一共有十个错误.During the national day holiday,I went to xi’an,where is really a very beautiful city.on October lst,my parents and I got there by the air.Actually,I was very excicing,because it was my first visit in xi 帮忙求下这三个极限 要用洛必达法则 已知二次函数的顶点坐标为（1.4）,且其图像经过点（-2.-5）,求此二次函数的解析式 Sample Question是什么意思? 要在墙上开一个上部为半圆,下部为矩形的窗户（如图所示）,在窗框总长度为l的条件下,（1）请写出窗户的面积S与圆的直径x的函数关系；（2）要使窗户透光面积最大,窗户应具有怎样的尺寸? It's a test question!test .要在墙上开一个上半部为半圆形,下部为矩形的窗户(如下图所示),在窗框为定长的条件下,要使窗户能够透过要在墙上开一个上半部为半圆形，下部为矩形的窗户(如下图所示)，在窗框为定长 two choice questionshe was a young woman.The woman was _____.a.a youth b.young c.a young d.youthshe heard planes _______ overhead.a.pass b.to pass c.to passing d.in passing麻烦说明下, 要在墙上开一个上半部分圆形下半部分为矩形的窗户,如图所示,在窗框为定长l的条件下,要使窗户要在墙上开一个上半部分圆形下半部分为矩形的窗户,如图所示http://hi.baidu.com/%BA%AF%CA%FD__/album/ 在△ABC中,∠C=90°,4b²+3c²;=4√3bc,能否求出∠A的度数 商店运进红,蓝,白气球共125个,其中红气球的个数是黄气球的2倍,白气球比黄气球多5个.红黄白气球各几个, 设计带式输送机传动装置中的一级圆柱齿轮减速器 运输带工作拉力F=2.1KN；带速V=1.6m/s； 卷筒直径450mm Please help translate the following sentence,thank you!If you risk nothing,then you risk everything. Please translate the following sentences for me.thank you!There is a period around weaning that is presumably critical for the maturation of the host immune system in terms of immune deviation. ( )两个不同重量的铁球同时从高处落下来,总是同时着地,( )铁球往下落得速度跟铁 球的轻重没有关系.（1）、括号填上一个恰当的关联词（2）、这句话含有两层意思,第一层意思是啥呢?（ ） 两个不同重量的铁球同时从高处落下来,总是同时着地,铁球往下落的速度跟铁球的轻重没有关系. 用多种方法计算下面图形的面积.（单位：cm)请用3种求法 求下面图形的面积,用多种方法列式.（长度单位：厘米） pls help to translate following sentences"any advantage,favor,privilege or immunity granted by contracting party to any product originating in or destined for any other country shall be accorded immediately and unconditionally to the like product ori 清明节的英语手抄报急用 半个小时之内必须要 急 有关清明节用英语的英语手抄报 清明节的英语手抄报[英语的] 清明节英语手抄报 Please help translate the following sentences into Chinese,thanks a lot.It is hereby certified that the product indicated above conforms to our standard internal specifications for the designated material.This certification is subject to our standard Please help translate the following sentences into Chinese.Thanks a lo.tAs a relief I requested 100 sets to ship on 06Jul,the rest can be shipped on 13Jul,but again this is rejected,reason I am getting is problems to allocate production time soon eno