等差数列首项是1，末项是9，各项的和为20，则这个数列的项数是

首字母填空的重点词语有哪些? The boy is good at swimming The boy（ ）（ ）.同义句 These boys are good at swimming.(同义句) These boys are_____ _____.要准确 These boys are good at swimming. =These boys are_____ _____ 往白纸上摁个手印然后把碘酒的蒸汽对着它会有什么反应这是为什么 英语翻译有什么具体的解释么? 碘酒所蒸发的气体为甚麽会使白纸上的指纹印记出现? Selfish ghost 翻译成中文是什么意思呢 当碘酒烤干后它的蒸汽中有什么物质?碘酒的烤干后的蒸汽和纸中的什么发生碰撞会是指纹重现? "中小型企业"英文怎么翻译? 中小型企业用英语怎么翻译 So much for the value part! so much so much for i like science better than other subject i science to other subjecti like science better than other subject等于 i() science（）to other subject 英语翻译俺英语差 请问这句用汉语怎么解释.I'll wait for you all the time! I'll wait for you all the time! waiting for you all time How lovely the weather is!(保持句子原义)_______ ______ weather it is! the mother is also so beautiful,the baby is so lovely翻译成中文上什么意思 Tom is too ( ) to say A.excited B.wanted c.reached D.played希望有详细分析 he is so angry that he could _____say anything 空格里填（几乎不） Lunch is my favuorite subject when I am at school.I am really good at it.求全文翻译 Who did you 我对英语只是一个菜鸟 who met you 与 who did you meet 一样吗 英语翻译手动运行ghost 哪个帮我翻译下 是用Whom did you meet?还是who did you meet?好 如图7-5-6所示,在光滑的水平面上有一物体,它的左端连一弹簧,弹簧的另一端固定在墙上,在力F作用下物体处于静止状态,当撤去F后,物体将向右运动,在物体向右运动的过程中,下列说法正确的是( 不及物动词是什么?在句子中有什么作用? 帮忙改下同义句Who will take care of the little chilren 1.Who will take care of the little children (同义句）Who will __ __ the little children?2.He spent too much time watching TV.（同义句）It __ him too much time __TV.3.Mary gets sch ghost 的菜单如何翻译成中文 求大神叫我如何读懂ghost菜单