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...
Independently, local transactions are executed under the control of the local DBMS.在多数据库中,全局事务是在MDBS的控制下执行, 局部事务在局部DBMS控制下独立执行.Microsoft Visual FoxPro 6.0 is an excellent small database management systems ( DBMS ).Micros...
Let's fingerprint the canoe, see if we come up with anything.让我们提取一下独木舟上的指纹，看看能不能有什么发现。It's here that we come up against the difference of approach.我们就是在这一点上面临方法上的分歧。They had come up from London loaded down wit...