【单选题】盐酸普鲁卡因与NaNO2试液反应后,再与碱性β—萘酚偶合成猩红色沉淀,是因为( )
【简答题】什么是句式选择?句式选择应遵循什么原则?
【单选题】盐酸普鲁卡因与NaNO2试液反应后,再与碱性β-萘酚偶合成猩红色沉淀,是因为( )。
【单选题】They finally came to a ______ that they would eat it together.
【简答题】做胰腺扫描应如何选择层厚及层间距?定位线应如何选择?
【单选题】After months of a hard voyage on the rough sea, they finally came to _____they called their “promised land”.
【单选题】盐酸普鲁卡因与NaNO2试液反应后,再与碱性β-萘酚偶合成猩红色沉淀,是因为