世界最先进空空导弹

bbl（桶）是什么单词的缩写?如题.如果是barrel的话为什么是两个b啊? shall we go at ten 同意句 求16公斤压力的法兰的内径和无缝管的外径,我25的法兰内径是31怎么比25无缝管外径多了5呢?急!国标DN25的16公斤压力的的无缝钢管外径是多少!国标25的16公斤压力的法兰内径是多少? he used to _____a walk after supper,_____he?A.take/usen't B.have/did C.taking/usen't D.have/used not 城市化的生态环境负效应有哪些? 城市化的作用 ( )of the students in our school has his own bike.A.Every B.Every one C.One That _____ boy is a new student in our schoolA.Japan B.China C.UK D.French选择其中的一个 植被\棕榈树 读音!是 植PI 还是BEI? Did your father _____take a walk after supper A.used to B.use to C.be used to D.was used to 棕榈两个的读音 they don't have ------- breakfast in the morning.A.the B.a C.an D./ 请帮忙翻 Our school is not the one that it used to be.不要百度翻译的那个什么我们学校是不是一个……的那个,请帮翻译的通顺点,谢谢 Our decision is that the school ______ closed.A .remain B.remains C.remaining D.is remained continuous effort is the key to unlocking our potential.unlockingunlocking这是什么词性呢?名词?这是叫目的状语吧?我感觉TO后应该是一个动词原型啊!怎么知道to在这里是个介词？the key to unlocking our potential都 春天棕榈树上长的绿色大果子是啥形状像竹笋,在树顶端长出来,是校园里的棕榈树.这几天长出来的 又见棕榈 又见棕榈怎么样 莱茵河流经哪几个国家? This old man is used to___after supperA.taking a walk B.to take a walk C.take a walk D.have a walk This is the garden ___ we used to pretend ____ a concert would take placeA where that B that where C where where D that that I___this free time although I____hate it A:used to;used to.B:used to;be used to.应该是哪个选项,请写出理由,但是这句话到底应该怎么翻译,是不是题错了）速度,C:am used to;be used to.D:am used to;used to 城市化的利与弊作文快回答 城市化是社会发展的标志吗?城市化有何利弊? 我国城市化发展的方向 The famous singer will _____ our town this afternoonA get in B reach to C arrive in D arrive it is______that a famous scientist will attend the meetingA)sureB)certainC)gladD)satisfied为什么不能选A,请说明选择原因2）they may____the books for about two weeksA)borrowB)lendC)keepD)have为什么不能选D 乙醇为什么没有碳碳双键?同样都有两个碳,为什么苯就有碳碳双键,乙醇没有?碳碳双键和氧化有什么关系?不好意思阿，不是苯，是烯烃有碳碳双键，乙醇没有为什么？ 你从这个项目中学到了什么?我学到了许多有关回收利用方面的知识.英文翻译这句子. 怎样鉴别物质是否含 碳氧双键写清所用试剂、现象 只要有碳碳双键就可以加成? in the bonds of holy matrimony是什么意思?the bonds of ,这是个短语吗?还有第in the bonds of holy matrimony是什么意思?the bonds of ,这是个短语吗?还有一个：even if Icounld get it together enough to ask a woman out.里面的g it is said that the who you suggested ____charge of the teaching affairs in our school has gone abrit is said that the man who you suggested ____charge of the teaching affairs in our school has gone abroad用take的形式来填,take 还是 took