【单选题】Lily has always wanted ________ the top student in her class, so she never gives up ________ even if she fails the exam sometimes.
【简答题】Frances is the top student in our class, but her aim is to _______(achievement) even better exam results.
【单选题】真核细胞核糖体单体及大小亚基的沉降系数分别为( )
【判断题】多层平壁传热时,若传热速率Q相同,则热通量q相同;同样的在多层圆筒壁传热时,若传热速率Q相同,热通量q也相同。
【单选题】在高马赫数飞行时,通过以下哪种方式提高飞机纵向稳定性?
【单选题】原核细胞和真核细胞核糖体的沉降系数分别为
【判断题】真核细胞核糖体的沉降系数为70S。( )