查询词典 paratungstate

Ammonium paratungstate has a great effect on the properties of the blue tungsten oxide , and blue tungsten oxide has a great effect on tungsten and tungsten carbide powder also; The tungsten carbide powder of good quality can be made from APT or blue tungsten oxide treated by a special process.

仲钨酸铵对蓝钨性能影响较大，而蓝钨物理性能对钨粉和碳化钨粉的性能影响也较大，通过对APT煅烧前或煅烧后进行特殊处理优选蓝钨原料，可以制取优质碳化钨粉。

Self-made tungsten trioxide (WO_3) by calcining ammonium paratungstate was selected as the raw material to produce ultrafme and homogenous tungsten powder by oxidation-reduction method.

通过研究，得到如下结论：(1)本研究选取的三氧化钨原料，通过氧化—还原法(4次氧化5次还原)是可以制备出超细钨粉的；所得金属钨粉的平均粒度约为0.38μm。

Commodities subject to export quota license are: corn, rice, wheat, cotton, wood products, live ox, live pig, live chicken, natural silk and its products, coal, coke, crude oil, finished oil, rare-earth metal, antimony oxide ore, antimony and antimony products, antimony oxide, tungsten ore, Ammonium Paratungstate, Ammonium metatungstate, Tungsten Trioxide and Blue Tungsten Oxide, Tungstic acid and salt, tungsten powder and its products, Zinc ores, Tin ores, tin and tin-base alloy, and white silver.

实行出口配额许可证管理的货物是：玉米、大米、小麦、棉花、锯材、活牛、活猪、活鸡、蚕丝类、煤炭、焦炭、原油、成品油、稀土、锑砂、锑及锑制品、氧化锑、钨砂、仲钨酸铵及偏钨酸铵、三氧化钨及蓝色氧化钨、钨酸及其盐类、钨粉及其制品、锌矿砂、锡矿砂、锡及锡基合金、白银。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。