回归是什么意思

如何提高氧气浓度?…… 英语名词复数变化规则?谁知道英语名词复数变化规则是什么啊?知道的跟我说一下吧, hot and humid weather 中文 混凝土配合比试验：包括原材料的检验~做砼配合比试验 标号M7.5、M10砂浆 C20砼、C25砼、C30砼、C35砼一共应该取多少样品? 铁是骨骼的组成部分正确吗 mp3耳机的电阻值为多少最好.用3.7伏锂离子电池. 谁知道普通MP3上用的耳机里面的可调电阻是多大耳机里面的可调电阻接触不好了,想换一个 用万用表测量MP3耳机的音圈电阻能烧毁耳机音圈吗? 耳机咪头灵敏度太高,怎样调低调一点 是加电阻还是加电容好点 求大神翻译.my mom said to me—the last of a thousand times—before I got on the plane 英语翻译同上 翻译：one in four Chinese primary school students say they are too busy to eat fruit every day. 翻译一下 他们正在上什么课? 上英语课. ?they? they‘er? 他们正在谈论中国地图.they?amap of china.我们一周俩次户外活动.we?a week学校在下午4点40放学.school?4：40p.m他通常在美术课上画画.（often,draw 耳机电压,电阻,电流,一般在什么范围之内怎么削除杂音,有些耳机削除杂音?怎么削除的, 手机耳机电阻多大手机耳机的电阻一般多大啊? A stranger a____ in front of me at that time.九年级英语 上册 As long as I am here, nothing make you unhappy什么意思? why i am unhappy?now 用英语回答 I am sorry that those coats are not available in your color and size.翻译句子及 available then they hear the sound again.kitty is afraid .Ben is not afraid .翻译 方便面,用英语 who do you think he is waiting for?中do you think 何成分我没钱,谁帮我? 英语翻译1 方便面没有营养 / 没有任何营养 / 没有一点 营养.2 许多房屋在地震中倒塌.3 水果有很多营养成分. The bus was so crowed that I could hardly get on. Was it crowded on the bus?答句?Yes,it is Yes,it was Yes,it does No,it didn't I was trying to get into the crowded bus .crowded做什么成分 If you are unhappy,I will be unhappy.（中文）如题 if you _____ too late,the host will be unhappy.空格里填什么a.arrive,b.get to,c.reach,d.arrive at When I got on the bus,I saw that _________ if you refuse his invitation,he will be unhappy为什么填invitation If you show your unhappy face,he will be unhappy,___.A.eitherB.alsoC.tooD.neither Leaves are found on all kinds of tress but they differ greatly in size and shape翻译汉语