Analysis of the water soluble salts in airborne dust samples collected in Beijing has been carried out by various analytic methods, the results show that K +, Na +, Ca 2+ , Mg 2+ , NH 4 + , SO 4 2- , NO 3 -, Cl -, F -, HCO 3 - and NO 2 - exist in the water solution of dust.
对北京尘土中水溶性成分进行了分析测定 ,结果表明 :水溶性成分中含有K+ 、Na+ 、Ca2 + 、Mg2 + 、NH4 + 、SO4 2 - 、NO3- 、Cl- 、F- 、HCO3- 、NO2 - 等离子。
The effect of electrical charged dust particles on electric contact and the method for measuring electric charges are discussed.
阐述了尘土颗粒带电对电接触可靠性的影响以及测量电荷的实验方法,并采用密立根方法对尘土颗粒的带电量进行了测量。
Regarding bad condition of oil, carbon powder and dust enter into Generator stator and dust enter excitor stator and high temperature of the excitor stator coil.
针对发电机静子漏进油、碳粉、尘土 ,励磁机静子漏进尘土等物 ,励磁机静子线圈温度高等不良现象 ,提出改进方案 ,实施后效果良好。
The determination of six noble metal ions(Au,Pt,Pd,Ir,Ru,Rh) in environmental dust samples by inductively coupling plasma-mass spectrometry(ICP-MS) was studied.
建立了用电感耦合等离子体质谱法(ICP-MS)测定尘土样品中贵金属元素Au、Pt、PdI、r、Ru、Rh的方法。
Covered or filled with dust.
多尘的为灰尘覆盖的或布满尘土的
Dust thou art, to dust returnest,
你本是尘土,仍要归于尘土,
The dusty road made the travelers dusty too.
满是尘土的路弄得行人也满面尘土了。
His jacket was caked with dust
他的上衣沾满了尘土。
dirt that had become ground into the surface
落在物体表面的尘土
The truck left clouds of dust in its wake.
车后扬起了一阵尘土。
His clothes are covered with dirt.
他的衣服上沾满尘土。
The rain laid the dust.
雨压下了飞扬的尘土。
He dusted his trousers.
他掸掉裤子上的尘土。
Dust swirled on the broad stairway.
宽阔的石阶上尘土飞扬。
He blew the dust off the book.
他吹掉书上的尘土。
crumble to [ into ] dust
碎成粉末, 化为尘土
The dust of the dead words clings to thee.
死文字的尘土沾着你。
The boy helped Mother sweep the dirt away.
男孩帮助母亲清除尘土。
Success in the world was dust and ashes to him.
他对世俗功名视若尘土。
The horses' hooves raised a cloud of dust.
马蹄扬起了一片尘土.
An obscuring haze, as of atmospheric dust or smoke.
烟雾，尘雾如空气中的尘土或烟雾等模糊的雾气
A cloud of smoke or dust that chokes or smothers.
沙尘弥漫呛人或令人窒息的烟雾或尘土