"Greenhouse gas" mainly consists of: A. Oxygen and nitrogen B. Carbon dioxide and methane C. Hydrogen and helium D. Argon and neon 相关知识点: 试题来源: 解析 B。“Greenhouse gas”主要由“二氧化碳和甲烷”组成。A 选项的氧气和氮气是大气的主要成分,但不是温室气体;C 选项的氢和氦不是主要的...
nitrogen [名詞] 氮 音源引用Dr.eye譯典通 短網址:複製網址 FB分享Line分享Google分享推特分享新浪分享 nitrogen ['naitrədʒən] n.氮 例句與用法: Air consists chiefly ofnitrogen. 空氣主要由氮氣組成。 If it were not for oxygen andnitrogenin the air, no man could live on the earth. ...
air - a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air" gas - a fluid in the gaseous state having neither independent...
Fabaceae, pea family of flowering plants (angiosperms), within the order Fabales. Fabaceae, which is the third largest family among the angiosperms after Orchidaceae (orchid family) and Asteraceae (aster family), consists of more than 700 genera and abou
(NO3)2.6H2O at 903oK for 24hours] and then into a cold trap at 77oK. A typical dry purification method consists of a mercury bubbler (as trap), followed by a small column of silver and gold turnings to remove any mercury vapour, towers containing anhydrous CaSO4, dry molecular sieves ...
Air consists chiefly of nitrogen. 空气主要由氮气组成。 The lamp is full of gaseous nitrogen. 灯里充满了气体氮。 Nitrogen is a gas without colour or smell. 氮是一种无色无臭的气体。 Nitrogen forms most of the Earth's air. 地球上空气的大部分成分是氮气。
9. The nitrogen cycle consists of several major steps. 氮循环由一些主要步骤组成。 10. All the samples are annealed at 780℃ for 30 seconds under pure nitrogen protection using a lamp rapid thermal annealing furnace. 根据TRIM-2000模拟计算,离子注入的能量采用160keV,然后在高纯N_2的保护下进行780℃...
Process of the Nitrogen Cycle consists of the following steps – Nitrogen fixation, Nitrification, Assimilation, Ammonification and Denitrification. These processes take place in several stages and are explained below: Nitrogen Fixation Process It is the initial step of the nitrogen cycle. Here, Atmosph...
Process for welding together the two longitudinal edges of a sheet of austenitic, ferritic or martensitic stainless steel so as to obtain a welded pipe, employing at least one laser beam having a power ranging up to 12 kW, and in which a gas mixture is used that consists of 30% to 80%...
1.Sample gas tubes are flushed with nitrogen.采气管得用氮气吹扫。 2.Air consists chiefly of nitrogen.空气主要由氮气组成. 3.condenser for nitrogen or other gases氮气或其他气体冷凝器 4.nitrous oxide gas一氧化二氮气体(笑气) 5.Nitrogen is the most commonly used gas.氮气是最常用的气体。