食物链没有天敌的动物

吊瓶的空气管作用是什么?是使瓶口压强与大气压强相等还是药液上方的空气与大气压强相等? 真空电镀厂对身体有那些危害? he is the last surviving member of the family 这he is the last surviving member of the family 这里的survive什么用法 数模题目该如何选择 今年数模大家想选什么题包括一个油罐体积的计算和各种油耗的考虑等问题了，第二题我感觉就是考虑到很多现实的数据之间的关系（包括人数，旅游业收入，地产）以及预测和预测实现的 最佳营销策略的数学建模某公司有一批以每桶2元购进的彩漆为了获得较高的利润希望以较高的价格卖出但价格越高,售出量就越少,二者之间的关系由表一给出.于是打算用作广告的办法来促销 输液管进了大约十厘米的空气还能输吗 打点滴时,输液管里有空气.上次,我在打点滴的时候,(在打之前,我已经看清楚了管子里没空气)针插入血管药水刚进,我看到有一小段象空气的间隙,马上流进血管去了.我不知道是真空还是空气? 英语翻译To cope with volatility and risks,negotiators should be prepared with advice from experts on the probability of economic and political risks in the target country.Armed with valid and reliable information on the most likely economic and p 英语翻译The dynamics of international business negotiations There can be no international business without the presence of at least two parties,each coming from different countries,sitting face to face and negotiating a business deal.Negotiations 英语翻译Currency Fluctuations and Foreign ExchangeWhen the Mexican currency crisis began in late 1994,the Wall Street Journal reported that within a week the peso had lost almost 36 percent of its value against the dollar,and 43 percent since the 英语翻译1.Most supermarkets in China provided free plastic bags.It was convenient for people to do shopping,but things changed.To protect the environment,supermarkets all over China stopped providing free plastic bags from June 1,2008.If you don' how interesting the place is =how interesting the place is = ------ ------- a very interesting place How interesting the place is(同义句) That is good bacause it makes the world ____interesting place.先填空, ___it is to play in such an interesting place A What a fun B How fun C How a fun D What fun 为什么不能选B? 英语翻译Last week everyone was trying to cheer up （使振奋；使高兴起来）Jimmy ,the Bike Boy .But this week ,Jimmy is happy again .On Monday he told a radio interviewer that he had run out of （用尽；用完）money to buy old bikes 这墙上是什么?感觉像化学药品的味 道.长期闻到有害吗? 英语翻译You'll fail in the exam unless you work harder.没有考试这个单词if,unless除非,as/so long as 只要,once 一旦还有一句翻译一下：She worked hard so that everything got ready by 6 o'clock. 有什么可以让土地寸草不生 吊瓶下面的通空气的管子是起什么作用的,管子为什么不在上面老师说通气管的作用是让空气进入瓶中,使药液上方有一定的气压,这样上方气压+药液产生的压强大于人体血管内的压强,药液就 碱让地寸草不生 汉室西迁长安,一把大火,使得河洛焦土一片,寸草不生,（赤地千里）.括号内词语错误,应如何修改 Doing everything is doing nothing.(同意句,越多越好） 请翻译:Doing nothing is doing ill. Doing nothing is doing ill. 从盐酸,硫酸,石灰水,烧碱,氢氧化钡,纯碱,硝酸钠,氯化钡（均为溶液)八种物质中选出四种,使得各条线相连的物质均能发生反应且生成难溶物.1碱1-----------酸22 交叉3盐3 -----------盐44求碱1,酸2,盐 纯碱是什么?烧碱是什么?石灰水呢? 输液时空气进入会怎么样? 这些空气如何排除?还有个疑问,血管受伤时 动脉是向外部输送血液,所以空气不会进入那静脉呢? 静脉的功能是将血液带回心脏,如果静脉破裂 整条断了,比较大的 输液进空气了刚输液的时候进空气了 从小细管那进去了有几段 .到现在30分钟了 没有特别的什么反应,我想问 会有什么影响吗?现在有点头晕 麻麻的? 输液进去空气了?怎么办?进多少空气是危险的 青色倒底是什么颜色?蓝色、绿色还是黑色?要说出依据来.