r在数学中表示什么

1道完成句子 初二英语连词成句 分别含有杏花、梨花、荷花、桂花、菊花、梅花的诗句 E.N.T是医学的什么缩写啊? t/a是什么单位缩写 谁知道S.T.D是什么缩写?谢谢 初二英语难题On Children’s Day,Hong Kong held a special activity.In this activity,children and their parents cated as the poor.At dinner,the rich could have delicious food while the poor could only have bread with porridge.Parents all hoped to 初二英语的难题!选择词语填空 leave for/sound like/take care of/be good for/grow up/turn on/think about/hang out/take part in/stress out/start with/36.the meeting_____light music and ended with the headmaster's speech.37parents,you shouldn students,so badly,wanted,the dolls,they,their studys,thinking about,were,not(连词成句) 在每一个空格中填一个单词,使两个句子意思相同或相近.1、A.Lucy can't sing the Englishi song"Yesterday Once More".And Lily can't sing it,either.B.______ Lucy ______Lily can sing the English song.2、A.I like Backstreet Boys.But h 英语翻译利用正交实验,通过直接计数法确定麦精与其他营养成分的最佳比例. 含有“桃花”“梅花”“荷花”“红杏”“菊花”“梨花”的古诗句 i am surprised at the news 改为同义句 i‘m surprised（ ）（ ） the news let us make dumpings 改为同意句( ) ( ) making dumpings 一个初二英语疑问（　　）Don’t　be　late　again!－（　　　　　　　　　　　）.I　will　get　up　earlier　next　time.A　Yes,I　won’tB　No,I　won’t 英语中的缩写I'd/I'll等等.像这种类型的缩写还有哪些?都是什么单词的缩写?请问没其它的了吗？ I'd .这是什么的缩写?1 我已经跟你说过了I’d told you 2 我们完了we'd finished 这其中的“I’d和we'd”是什么的缩写? i.e.为什么老有人说它是"例如"的意思?那么"例如"的简写是什么? 梨花 桃花 荷花 杏花 梅花 菊花含有这6种花名的古诗句 "体育课"的英语缩写形式到底是"P.E."还是"P.E"?有没有那个点啊?快回答哦 P-E是什么的缩写 P.E.是什么的缩写 P.E.是哪个单词的缩写 有谁知道P.E.是什么学科的缩写 有梅花、荷花、桂花、菊花的诗句我的一个选作题, lt's的缩写 lt是什么缩写 HKEY是不是某几个单词的缩写,H和KEY?注册表根键的开头HKEY.但我不知道怎么来的这个词,怎么读? 液位仪表的是LT是什么单词的缩写?顺便问一下FT和TT和PDT和PT是什么的缩写 i would have come earlier,but i __you were waiting.为什么选didn't know不选hadn't know? i would have come sooner ,but i ___that you were waiting .a.knewb.didn't knowc.hadn'td.don't know写出原因! I would have come sooner ____possible,but I____that your were still waiting for me.A.it were...didn't konwB.were it ...hadn't knowC.it had been..wouldn't have known D.had it been...didn't know.答案是选D.希望可以解释一下这句话的意思.