5.The catalysts and reaction conditions have been studied for esterinterenange between propenyl carbonate and methanol to produce dimethyl carbonate (DMC).
研究了烯和甲醇经交换制备甲的催剂及反应工艺条件。
6.The analytical method of sodium carbonate,sodium hydrogen carbonate and total alkality in natural alkali was studied by combining nonwater titration with acid-base titration.
研究了非水滴定和碱滴定相结合测定天然碱中钠、氢钠和总碱度的分析方法;
7.covered with caliche, a hard calcium-carbonate encrusted soil.
被硝钠，和硬钙覆盖的土壤。
8."aragonite: an orthorhombic mineral form of crystalline calcium carbonate, dimorphous with calcite."
霰石:文石结晶富钙物的一种正交晶矿物,具有方解石的两种晶态。
9.The carbonate cements, mainly consisting of ferroan calcite and ankerite, are telogenetic cements.
这样形成的盐胶结物为晚期胶结物，主要为含铁方解石和铁白云石。
10.the plates were coated with 500 ng of protein in sodium carbonate buffer.
平皿上涂有含500毫微克蛋白质的钠缓冲。
11.Eodiagenesis is characterized by the assemblage of carbonate-analcime-anhydrite, while authigenic kaolinite is found in some strata.
浅埋藏期以盐～沸石～硬石膏组合为特征。
12.The synergistic effect of vanadate and antimonyl potassium tartrate in the passivation step of mild steel in hotpotassium carbonate solutions is studied.
钒盐临界致钝浓度与钾转度的关系;钒盐与锑盐的协同作用;
13.Bentonitic siltstone and bentonite-carbonate rock sedimentary deposit are aggraded as the top of Laogonggou stratum;
顶部为一套滨浅湖相的膨润土粉砂岩-膨润土-盐岩沉积岩石组合。
14.The ability of the gas phase inhibitor—cyclohexylamine carbonate (CHC)for chemical equipment was studied.
研究了气相缓蚀剂环己胺（CHC）用于工装备保护的可能性。
15.Abstract： The abihty of the gas phase inhibitor--cyclohexylamine carbonate(CHC) for chemical equipment was studied.
摘 要： 研究了气相缓蚀剂环己胺(CHC)用于工装备保护的可能性。
16.The synthesis methods of double (three chlorine methyl) carbonate by using solvent and nonsolvent method are introduced.
给出了溶剂法和非溶剂法两种合成双(三氯甲基)的方法。
17.carbonated drink flavored with an extract from sarsaparilla root or with birch oil and sassafras.
用菝葜根提取物或白桦油和擦木调味的饮料。
18.The current preperation methods of strontinum carbonate from celesite are carbon reduction method and double decomposition method.
中国天青石资源十分丰富,但矿石品位低、杂质含量高,需经选矿除杂后才能作为生产锶的原料。
19.Glauconite, detrital carbonate skeletal debris, marine fossils, and collophane are commonly present.
钠
盐
氧
]
甲
（等于methyl carbonate）
烯
