Taking pyromellitic dianhydride and thionyl chloride as raw key material, 2,5-bis(methoxycarbonyl)terephthaloyl chloride was synthesized.
以氯化亚矾及均苯四甲酸酐

原料通过酰氯法合成了对位均苯二甲酯二酰氯。
Taking pyromellitic dianhydride and thionyl chloride as raw key material, 2,5-bis(methoxycarbonyl)terephthaloyl chloride was synthesized.
以氯化亚矾及均苯四甲酸酐

原料通过酰氯法合成了对位均苯二甲酯二酰氯。
The Coda features the tune combined with an evocative countermelody in the piano.
结尾
分的特征在于结合了钢琴的对位旋律。
It is unrealistic to presuppose a sophisticated knowledge of harmony and counterpoint in a beginning music student.
求一个初学的人具有和声学和对位法方面的知识是不现实的。
Methods During the operation, the renal blood supply was blocked for 10 minutes after intravenous of 2g inosine in normothermia.
方法术中采
静脉注射肌苷后,常温下阻断
血流,根据
破裂情况,分别采

分切除、分层对位缝合、血管修补等修复手术。
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