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形容人性格的词 ,比如纸老虎,应声虫,老古董,这些约定俗成的词语 急, 人耳要听到声音,必须满足条件是:一定要有正在( )的物体,即（ ）；声音能传到人耳必须要有（ ）,（ ）不能传播；声音的频率一定要在人的听觉范围内,即（ ）,声音的频率的高低决定了声音 人耳能听到声音的条件是A:有发声体 B:只和物质有关C:只和温度有关 D有发声体,介质和健康的耳朵 人可以听到声音 条件是什么（写四个） 人耳听到声音必须具备的两个条件 极端自豪、分辨不清、处理事件、约定俗成哪个短语搭配不当 极端自豪 分辨不清 处理事件 约定俗成 .对付进攻,理由充分,封锁消息,热情欢呼.改正不恰当的短语.极端自豪 分辨不清 处理事件 约定俗成 .对付进攻,理由充分,封锁消息,热情欢呼.研制潜艇, 从声音的发生和传播来看,人耳要听到声音必须具备三个条件 请问今晚有流星雨吗?(2006/12/14)今晚有流星雨吗 这个符号怎么打?如图!请问楼下的,怎么打的? 极端自豪 分辨不清 处理事件 约定俗成 （找出不恰当的短语,并改正）如题 is it today hot 连词成句 急 连词成句,注意标点符号 cold Is today it ? 2012年12月14日晚有流星雨吗?是什么星座的流星雨啊?几点?在绍兴可以看得到吗? 写一篇以温暖为话题的作文 已知动点P与双曲线X^2-Y^2=1的两个焦点F1,F2的距离之和为定值2根号3,求动点P轨迹方程 已知动点p与双曲线x^2－y^2=1的两个焦点F1,F2的距离之和为定值二倍根号三.求动点p的轨迹方程；设M(0,-...已知动点p与双曲线x^2－y^2=1的两个焦点F1,F2的距离之和为定值二倍根号三.求动点p的轨迹 已知动点P与双曲线x^2-y^2=1的两个焦点F1,F2距离之和为定值,且cosF1PF2最小值为-1/3,求动点P轨迹方程 Mark was walking home from school one day 完形填空Mark was walking home from school one day when he noticed a boy ahead of him.He had tripped and dropped all of the books he was carrying,along with some clothes,a baseball bat and a glove.Mark s__ 完形填空： Walking home from school one day.Mark noticed a boy ahead of(1)____tripped anddropped some things.Mark came up to himand helped him(2)____them up.Since they were going the same way,he helped to carry some things.(3)____they walked,Mar 求写800字作文（任意题目,最好叙事文, Robert was walking home from school one day.A boy in front of him fell over and dropped all of his 有一年初春,我背这枝猎枪,在贝尔湖畔观光.那年的春天来得特别早,一些候鸟从南方飞来.可是,谁也没有想到,突然寒潮降临,北风呼啸,湖面有上冻了.有些刚飞来的候鸟只好飞走,再找暖和的地 看中文,写英语 He has been away from home for three yeas中怎么对for three yeas提问我英语很差!教教我! The girl has been away from home for three days.同义句Three days has passed_____the girl_____home. jim ___for three weeks leaves for England has left for England has gone to England has been a way区别是什么?jim ___for three weeks。A leaves for EnglandBhas left for England Chas gone to England Dhas been a way My father is not in shanghai recently .He_____home for nearly three weeksA）has been away from B）has left C）has gone away D）has left for求讲解 绿色千岛湖中的举例子的句子北师大版 绿色千岛湖中举例说明和列数字说明的语句这回就要 高中数学求讲解过程 什么是声光控开关?