什么动物下雪天出来

有一种物质能顺浓度梯度进出细胞膜,但却不能顺浓度梯度进出无蛋白质的磷脂双层膜.这种物质出人细胞膜的方式是 ( )A．自由扩散 B．协助扩散 C．主动运输 D．胞吞、胞吐选什么为什么 函数f(x)=-x²+2x+3在区间[-2,2]上的最大最小值分别为 f(x)=2X²-2ax+3在区间【-1,1】有最小值2,求a的值 请问有没有模型解题法啊,发我一份吧. 望发模型解题法 求模型解题法具体内容一份 DNA 着丝粒 染色体有什么区别 和 联系 若一个正方形的边长减小4cm它的面积就减小48平方厘米,则这个正方形原来边长为__cm 一个边长为4cm的的正方形里剪去一个最大的圆,这个圆的半径是（）cm,面积是（）平方厘米剩下的面积是（）平方厘米. there are too much kids in the dining room.哪里错了 血浆和血细胞的分层中间的白色物质是什么 望发送模型解题法高中全集 求一套模型解题法, 高中模型解题法 求模型解题法高中版. There is one shower in Rick's family （对划线部分提问one划线）＿＿shower does Rick's family The old man usually leaves his house at 8;00 in the morning.(对划线部分提问）（leaves his house划线）＿＿the old man usually _at 8: 细胞分化的结果形成不同的组织对吗? 四级过了还想考,四六级一起,可以么?1.考了四级过了.下半年就考六级了.想和六级一起考,可以么?2.分数怎么算啊?哪一次高就算哪一次的,还是怎么的. HOW MANY STUDYS ARE THERE IN HER HOUSE?怎么改错?HOW MANY 是A,STUDY S是B ARE THERE是C HER HOUSE 是D 填空 there__(be) much furniture in the room快求.急 I have ______ (many) furniture in my house.They are the sofas,the chairs,the desks and so on.写出括号内单词的适当形式完成句子.（你要是回答了,哼哼,有.【心动不如行动】我只选前三个回答者中的一个!） 在这几个空里填字母组成一个短语或词语y_u__y_i中间可以适当增减几个空,最好是就填四个字母进去组成一个有点意义的短语就可以了(拼音也可以) 四、五、六单元的,（ A、B卷的都要）.就2天时间, recycle 将十进制数30化为三进制数 英语翻译1.实突厥屡为寇患,以艺素有威名,为北夷所惮,令以本官领天节军将镇泾州2.过乌氏驿,从者渐散,其左右斩艺,传首京师.枭之于市,复其本姓罗氏. 英语翻译4.2 Policy challenges at the sectoral levelFollowing these considerations (and caveats) on the policy relevance of electronic business developments in general,the question is which instruments policy could use to intervene in this develop 英语翻译Statistical analysis of quantitative data gathered prior to the first user trials showed that there are a few significant differences between Croatian respondents and the respondents from other countries regarding their attitudes to the u 英语翻译Whether the friend's audacious plan was heartless and foolhardyor redemptive and courageous,it illustrates Wollstonecraft'srebellious independence and her identification with women'ssufferings.Wollstonecraft responded to Burke's eloquenta 小学语文五年级下第一单元通常考什么作文和阅读? 必修三英语周报31期答案要是高一必修三4单元的,第31期,要含听力的啊. 近年来我国发生哪些重特大火灾事故（详细）?