Aspirin is synthesized through O - acylating reaction from acid and anhydride acid with anhydrous carbonate as catalyst.以水杨酸和乙酸酐为原料,采用无水碳酸钠作为催化剂经O - 酰化反应合成了阿司匹林.In 2002, we develop Photo - catalyst & electronic Ionizer A...
我进一步理解了这些符号及其意义。I became more aware of the symbols and their meanings.汞的化学元素符号是什么？What's the chemical symbol for mercury?改动作曲家原有的符号是亵渎行为。It would be sacrilege to alter the composer's original markings....
The pink lacquered paint covers the bronze symbolizes solar energy and fire.此雕刻以粉色包裹,象征着热情的精力与火.Use is made of solar energy in heating houses.双重定语引起的分隔.There are a lot of new buildings benefiting from the harnessing of s...