【单选题】人民解放军解放南京的时间是1949年( )
【判断题】炸药按其组成分类有:单质炸药、混合炸药。
【单选题】The numbers that researchers get from the experiments can be _______, just like number puzzles.
【单选题】________ enough time and money, the researchers would have been able to discover more in this field. ( 1998)
【单选题】与冠状动脉粥样硬化的形成关系最密切的因素是: