【判断题】端粒酶( telomerase ) 是核蛋白逆转录酶,以自身 RNA 为模板,合成端粒 DNA ,将端粒 DNA 加至真核细胞染色体末端,为细胞持续分裂提供遗传基础。
【简答题】An object is doing harmonic motion. What is the direction and magnitude of its acceleration when it has maximum positive position ?
【简答题】An object is doing harmonic motion. What is the direction and magnitude of its acceleration when it has maximum negtive position ?
【单选题】计算机中央处理器( CPU )是指( )
【简答题】It is the direction that a string will assume if a weight is attached at that point and the string is suspended freely at the point.
【单选题】某产妇足月顺产后1日,评估其身体状况时,可能异常的项目是
【单选题】某产妇足月顺产后1日,评估其身体状况时,可能异常的项目是