系带卵

一.将15g盐溶于105g水中,盐水的含盐率是百分之几?再加入多少克水,含盐率降到原含盐率的一半? 二.织女星每秒运行14km,牛郎星运行的速度比织女星快85.7%.牛郎星每秒运行多少千米? 我刚学会了魔方的入门方法,我现在得5分钟才能还原一个魔方,实在太慢了,我想问一下,如果我想提高速度的话,用3块钱一个的魔方行不啊?如果不行的话,该买什么魔方呢? 帮我解一道初三二次根式根号下 1/2-1/3 初三上学期二次根式解方程,25χ-36=0χ²+4χ-5=0﹙2χ－5﹚²－﹙χ+4﹚²=02χ²－7χ+3=0 初三的二次根式的全部知识我要考自学试啊.麻烦哪位大哥帮帮忙教我 请教此句开头的while是什么意思"While the revisions to real GDP were small,they generally reinforce the view that economic activity will snap back in the current quarter," said Mark Vitner,a senior economist at Wells Fargo Securities in Cha 一个句子以'while'开头表示什么意思?是转折吗 0.5的倒数 1.25的倒数 五分之六时=（ ）分 十分之七吨=（ ）kg正方形的变成是十分之久,他的周长是（ ）m 他的面积是（ ）平方米 有关于“三”的成语、俗语、歇后语、古诗、地理知识等急! 与地理知识有关的诗词、笑话、成语 黄河的地理知识,诗歌,俗语,传说个一个! 有谁知道"DK"是什么意思啊?求大神帮助谢谢,知道的请告诉我一声啊! 一道宾语从句选择题The girls asked if they____some food and drink with them.A.tookB.takeC.takesD.will take应该是选A吧? 宾语从句的一道选择题Our teacher asked me .A.what was Ann doing these daysB.why Peter didn't come to school the day before yesterdayC.when will the dolphin show beginD.how long did I spend on my homework选B,翻译一下,再讲一下为什 有含盐18%的盐水20公斤,要是盐水含盐16%,需要加水多少公斤? a为什么整数时,方程x/(x-2)+(x-2)/x+(2x-a)/x(x-2)=0只有一个实数根?老大 你们说的情况是有两个相等实根....题目是一个实根 一道有关宾语从句的选择题Did you ask the teacher ＿＿＿＿ the day before?A. what was happended to herB. what she had happenedC. what she happenedD. what had happended to her请说明理由. 一个宾语从句的选择题Could you tell me where___get___magazines?A I can/some B can I/someC I can/any D can I/any 急!100之内的质数是什么 大房小房房连房,七条成语房中藏.若要一一找出来,除非心明眼又亮中找出三个成语 the companies are working together to create ____ they hope will be the best means of transport in the 21st century.A.which B.what 为什么不选a? 几个关于宾语从句的选择题. 宾语从句的选择题The teacher asked him.A.if the classroom had beencleanedB.when was Albert Einstein bornC.how would the scientists find out the resultD.where could he find the library选A.先翻译一下,为什么选A,而不选别的? 3道宾语从句选择题No one told us _____, so we need your help.A. how should we doB. what should we doC. how to do it D. what to do it请详细分析下,这个应该是宾语从句,宾语从句主句用过去时态,从句也要相应用某种过 一棵度为3的树有2个度为1的结点,3个度为2的结点,4个度为3的结点,则有多少个叶子结点?给出公式和计算方...一棵度为3的树有2个度为1的结点,3个度为2的结点,4个度为3的结点,则有多少个叶子结 甚矣,汝之不惠的甚 甚矣,汝之不惠.现代汉语意思?什么句式? 河曲智叟笑而止之曰：:甚矣,汝之不惠.解释? 100以内的所有质数都有哪些?要100以内的所有质数,要按照一个比一个大的顺序,请告诉我全部的100以内的质数,不可多也不可少, 100以内所有质数快 大家帮忙找一下100以内的所有质数一定要按顺序,且要一字不漏的打出来!按错了,是1000以内的! 一棵二树叉中度为0的结点总是比度为2的结点多一个?