查询词典 rare

However, any high quality cut alexandrite gem larger than 5 carats is be extremely rare.

然而，任何高品质的切割宝石宝石大於5克拉，是极为罕见的。

Promotion effects of alkaline earth metals and rare earth metals on catalytic activity and coking resistance of the catalyst are also described.

阐述了碱土金属和稀土金属助剂在提高催化剂的重整活性和抗积炭能力方面的作用。

The anion-exchange ion chromatography is suitable for the separation and analysis of alkaline earth metal ions, transition metal ions and rare earth metal ions.

综述了离子色谱法分析金属离子的研究进展，对目前应用于分析金属离子的阳离子交换IC、阴离子交换IC和螯合离子色谱进行了评述。

The components comprise the following materials: 40 to 50 percent of GeO2, 20 to 25 percent of SiO2, 0 to 10 percent of Al2O3, 5 to 16 percent of MO or MF2, 0 to 10 percent of R2O3, and 1 to 10 percent of ZrO2; the M is one or more of the alkaline-earth metal ions, the R is one or more of the trivalent rare earth ions.

一种0.3～5um波段红外透过耐高温玻璃陶瓷材料及制备方法，成分包括GeO 2 40-50％，SiO 2 20-25％，Al 2 O 3 0-10％，MO或MF 2 5-16％，R 2 O 3 0-10％，ZrO 2 1-10％；M为碱土金属离子中的一种或几种，R为三价的稀土金属离子中的一种或几种。

The effect of alkaline metal, alkaline-earth metal or rare-earth metal oxides doping to Pd/γ-Al〓O〓 on the properties of supported palladium catalysts were investigated.

研究含氧条件下单Pd催化剂上进行丙烯选择催化还原NO的反应，考察浸渍法制备的Pd/γ-Al〓O〓催化剂中加入碱或稀土金属氧化物助剂对NO转化率的影响，并对催化剂进行了XRD表征及在氧化气氛中饱和吸附NO后的TPD研究。

Despite the high incidence of intervertebral disc diseases among patients with alkaptonuria, neurologic symptoms caused by spinal disease are rare.

虽然尿黑酸病人的椎间盘疾病的发病率高，但由此引起神经症状却很少。

SUMMARY OF BACKGROUND DATA: Alkaptonuria, a rare hereditary metabolic disease, is characterized by accumulation of homogentistic acid, ochronosis, and destruction of connective tissue resulting in degenerative spondylosis and arthritis.

背景数据信息概要：尿黑酸尿，一种罕见的遗传性代谢疾病，特点是尿黑酸积聚，黄褐病，和相邻组织的破坏，导致退行性的脊椎关节强硬和关节炎。

It is rare for a person to have all of these symptoms at once.

这是难得的一个人具备所有这些症状在一次。

But he's a complete midfielder, a rare all-rounder and although he's a slightly different player to Roy Keane, he can become as great.

虽然他和Roy Keane特点略有不同，可是我相信他能成为和Keane一样伟大的球员。

X-ray diffraction, infrared spectrum, Mossbauer spectrum, and absorption spectrum have been used to study allanite in some rare-earth deposit in this paper.

本文采用晶体场谱、穆斯堡尔谱、红外光谱和X射线衍射等多种手段研究褐帘石的谱学特征。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。