of each element. Each row is a period and each column is a group. All groups are given a specific number and many of them are also given a specific name. Elements in a group share certain common chemical properties, including the number of valence electrons present in their neutral atoms....
isfamedforbuildingschools,healthcenters,housing,andotherpublicspacesacrossAfrica.His buildingscanbefoundinhishomeland,aswellasinBenin,Mali,Kenya,Mozambique,TogoandSudan. Whenhewas20,in1985,Kéréearnedavocationalscholarshiptostudycarpentry(木工)in Berlin.Butwhileabsorbedinthepracticalityofroofingandfurnituremaking,...
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
A.that B./ C.what D.it相关知识点: 试题来源: 解析 A 考查定语从句。Gas为先行词,在定从___ helps fire burn中作主语,且that作主语时不可省略。所以选A。 分析总结。 gas为先行词在定从helpsfireburn中作主语且that作主语时不可省略反馈 收藏 ...
A. Digestion. B. Respiration. C. Filtration. D. Production. 相关知识点: 试题来源: 解析 B。解析:“The lungs are also essential. They take in oxygen and release carbon dioxide. This process is called respiration”,肺吸入氧气并排出二氧化碳的过程叫做呼吸作用。反馈 收藏 ...
Plants release oxygen into the air. This is important for what? A. Keeping the air clean B. Making the air dirty C. Stopping animals from breathing D. Harming the E. nvironment 相关知识点: 试题来源: 解析 A。解析:植物释放氧气到空气中,这对于保持空气清洁很重要。选项 B 使空气变脏错误,...
Scientists at MIT are trying to figure out where the oxygen in the universe comes from, and how oxygen and carbon are made.
Oxygen therapy is used to normalize the oxygen level in blood during sleep, rest, activity and during acute illnesses in the hospital. It can assist with the growth and development in children with chronic lung conditions. In adults with chronic lung disease, studies have shown that long-term ...
nov. for the first time in Germany. Furthermore, we redescribe L. latipennis based on freshly collected material with a closer examination of the holotype. Derived from our findings, we review the genera Lepiseodina Enderlein, 1937 and Telmatoscopus Eaton, 1904, providing an identification ...
Is oxygen the only gas ___helps fire burn?( )A.thatB./C.whichD.what 相关知识点: 试题来源: 解析 答案A解析:考查定语从句.先行词 gas,helps fire burn是定语从句,关系词在定语从句中做主语,指物,又因为先行词被the only修饰,故用that.故选:A. 氧气是能帮助火燃烧的唯一气体. 结果一 题目...