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内容:正在发展的电源主要有
钠
硫电池、镍铬电池、锂电池、燃料电池、飞轮电池等,这些新型电源的应用,为电动汽车的发展开辟了广阔的前景。
人类史上最严重的11项生态灾难
猎鹰
13年4个月前
回复于
地理与地质
内容:员工又钻孔至竖井下方的砾石,然后注入1500升的水玻璃(硅酸
钠
)。
气相二氧化硅.介绍
hx
12年5个月前
发表于
喷气推进
内容:高压
钠
灯以及各种用于拍照、摄影的碘弧灯都要求强照明,但是灯丝被加热后69%的能量转化为红外线,这就表明有相当多的电能转化为热能被消耗掉,仅有一少部分转化为光能来照明,同时,灯管发热也会影响灯具的寿命,如何提高发光效率
移动通信发展历程之三:电磁波的发现
mass_lynnxy
18年11个月前
回复于
电子技术
内容:说这赫兹发现了电磁波就如当年牛顿发现了万有引力,戴维电解出钾、
钠
之时,都是才刚刚二十几岁的年纪,正宏图初展,前途无限。
山上拍的不知是什么植物
MoMoNiz
12年8个月前
回复于
农业
内容:蛋白质1.5克,脂肪0.1克,粗纤维3克,碳水化合物13克,灰分1.1克,胡萝卜素30微克,硫胺素0.03毫克,核黄素0.02毫克,尼克酸0.1毫克,抗坏血酸2毫克,维生素E类1.82毫克,钾212毫克,
钠
5
F的父亲
hamdad
16年0个月前
回复于
化学
内容:莫瓦桑还长期从事金属氢化物的研究,他用氢气与多种金属反应制备了氢化钙、氢化
钠
、氢化钾、氢化铷等多种化合物并深入研究了其性质。
第三节 现代化学的发展
大仙
16年6个月前
回复于
科学技术学
内容:例如,食盐即氯化
钠
分子中,碱金属
钠
元素的最外层只有1个电子,失去这个电子后就形成最外层有8个电子的稳定结构,而卤族元素氯最外层有7个电子,它获得一个电子后,最外层就形成了具有8个电子的稳定结构,因此,当两者相互作用时,,
钠
原子的一个电子转移到氯原子一边,从而形成了
钠
的正离子和氯的负离子,正负离子通过静电吸引作用而形成化合物。
【水】【原创】简单的分析一下业余火箭发动机的技术路线
154454496
5年7个月前
发表于
喷气推进
内容:10、硫(单质)系推进剂优点:高的邪乎的密度(想方设法提到5.多不是梦),永远管制不全的原料(至少硫代硫酸
钠
就算管了也有门道能整(初中物理八上)),简单的制造工艺,壮丽的火焰(适合做烟花)缺点:低比冲(
详解固体火箭发动机(转帖)
空中米格
16年0个月前
发表于
喷气推进
内容:氧化剂通常占推进剂总重量的60~90%,许多无机化学品可作为氧化剂,如高氯酸盐类(高氯酸钾、高氯酸胺、高氯酸锂),硝酸酯类(硝酸胺、硝酸钾、,硝酸
钠
),现在使用最多的是含氧量较高的高氯酸胺(AP,又称过氯酸胺
这电容。。。
小特斯拉圈圈
15年6个月前
回复于
电磁炮
内容:采用化学法来处理多氯联苯的方法已达10种以上,如氯解法、加氢脱氯法、Sunohio法、湿式催化氧化法、金属
钠
法、Goodyear法、金属
钠
-聚乙二醇法、臭氧法等,其中有些已有实用装置或工业试验装置,有些在实验室规模已取得成功
【精品知识点】-- 高考化学复习热点问题专题训练--离子大量共存问题。
mithril
16年1个月前
回复于
化学
内容:NO3- XXXXN- XXXX32+ 28.向某溶液中加入过量盐酸生成白色沉淀;过滤后向滤液中加入过量的氨气(使溶液呈碱性),又有白色沉淀生成;再过滤后向滤液中加入碳酸
钠
溶液,又生成白色沉淀
引用:战略导弹固体火箭发动机。纯手工排版过来的,累死我了
蛋蛋个蛋蛋
12年5个月前
发表于
喷气推进
内容:氧化剂通常占推进剂总重量的60~90%,许多无机化学品可作为氧化剂,如高氯酸盐类(高氯酸钾、高氯酸胺、高氯酸锂),硝酸酯类(硝酸胺、硝酸钾、,硝酸
钠
),现在使用最多的是含氧量较高的高氯酸胺(AP,又称过氯酸胺
美国的过氧化氢聚乙烯自燃式固液火箭发动机
清纯小萝莉
12年5个月前
回复于
喷气推进
内容:.- 喷嘴橡木制的,涂有硅酸
钠
,具有阻燃性能。
强国的脊梁--固体火箭发动机浅析
大号是中华
16年6个月前
发表于
喷气推进
内容:氧化剂通常占推进剂总重量的60~90%,许多无机化学品可作为氧化剂,如高氯酸盐类(高氯酸钾、高氯酸胺、高氯酸锂),硝酸酯类(硝酸胺、硝酸钾、,硝酸
钠
),现在使用最多的是含氧量较高的高氯酸胺(AP,又称过氯酸胺
伦琴射线发生器资料贴
虎哥
13年8个月前
回复于
核技术与核仪器
内容:底片处理中必须有水洗程序,水洗的质量决定于(d):a.水温 b.水洗时间 c.水洗方式 d.以上都是 96.底片水洗不足会导致产生(b),使得底片出现斑点,照片变黄:a.溴化银 b.硫化银 c.硫酸
钠
,d.硫代硫酸
钠
97.底片处理中影响定影过程的主要因素是(e) a.定影液温度 b.定影时间 c.定影液的老化程度 d.定影操作 e.以上都是 98.定影液温度高时会(d) a.定影进行快 b.,以上都是 107.配制好的显影液储存应注意(d):a.避光 b.密闭 c.配制好至使用之间相隔时间不能太长 d.以上都是 108.盛放显、定影液的槽子应定期清洗,并选用(a)清洗较为合适 a.次氯酸
钠
,(a) a.锂(原子序数2) b.
钠
(原子序数11) c.铝(原子序数13) d.钙(原子序数20) 282.在射线检测中由于底片的种类、底片的处理、底片黑度或增感屏等因素所造成的对比度称为(b)
国家中长期科学和技术发展规划纲要(二OO六—二O二O年)
管理处
19年0个月前
发表于
极客DIY
内容:研究并掌握快堆设计及核心技术,相关核燃料和结构材料技术,突破
钠
循环等关键技术,建成65MW实验快堆,实现临界及并网发电。
零排放的环保轿车 试驾奔驰Smart ED
mass_lynnxy
17年4个月前
回复于
极客DIY
内容:其实,可做电动汽车动力源的电池有很多,诸如铝/空气电池、锂/硫化铁电池、镍/钙电池、
钠
/硫 电池、镍/锌电池和锌/空气电池等许多种,其中锌/空气电池值得一提,其单位重量储能达到215wh,一次充电行程已达到
液態呼吸術
用户已注销
16年6个月前
回复于
极客DIY
内容:(4)麻醉及手术:用3%戊巴比妥
钠
(30 mg/kg)静脉注射麻醉,股动脉插管监测动脉平均压、心率及采集动脉血气(ABG),颈外静脉插管建立液体通道及监测中心静脉压,动静脉通道分别连接Interflow
第四章 现代自然科学的发展
大仙
16年6个月前
回复于
科学技术学
内容:汤姆生还发现不管怎样改变电极的材料(铝、铁、
钠
等),阴极射线粒子的荷质比总是保持不变。
战斗机的隐身技术
wangyuewo56
17年1个月前
回复于
极客DIY
内容:载自拙作部分内容\"所谓等离子体是指当任何不带电的普通气体在受到外界高能作用后(如对气体施加高能粒子轰击、微波/激光照射、气体放电、热致电离、高超音速飞行器的激波,燃料中掺有铯、钾、
钠
等易电离成分的火箭和喷气式飞机的射流等方法,碱金属燃料燃烧:在燃料中掺有铯、钾、
钠
等易电离成分的火箭和喷气式飞机的燃气射流,都可以形成弱电离等离子体。
Re:借大家之力 重新解决一下 部分网址打不开的问题
bighead
15年10个月前
回复于
喷气推进
内容:XXXXXXXXXXXX/t/7527现在做完的 XXXXXXXXXXXXXXXXXXXX/t/6610knsu火箭发动机及流行二号火箭 XXXXXXXXXXXXXXXXXXXX/t/6609石膏——硅酸
钠
喷嘴
第九节 环境保护技术
大仙
16年6个月前
回复于
科学技术学
内容:施加硫化
钠
、石灰硫磺合剂等硫源物质,可使汞、铜、铅等在土壤嫌气条件下生成硫化物沉淀。
双螺旋——发现DNA结构的故事
1211
19年2个月前
回复于
科学技术学
内容:看来,威尔金斯和罗西坚持研究DNA的
钠
盐似乎是正确的。
嗅一嗅你的NG有沒有洗得干干靜靜
1211
19年2个月前
回复于
科学技术学
内容:因此,在生理条件下,总有些
钠
和镁之类正电离子中和它们附近带负电的磷酸基团。
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