【单选题】在一个DNA分子中,腺嘌呤与胸腺嘧啶之和占全部碱基总数的42%。若其中一条链的胞嘧啶占该链碱基总数的24%、胸腺嘧啶占30%,则另一条链上,胞嘧啶、胸腺嘧啶分别占该链碱基总数的 [ ]
【简答题】In accordance with UCP 600, which of the following terms may NOT be altered on a transferred documentary credit? The: (1)( ) amount. (2)( ) required documents. (3)( ) period for presentation. (4)( ...
【单选题】在一个DNA分子中,若A分子数占30%,则A+T的分子数占
【单选题】最典型的应用是用于汽车车身的自动装配生产线的是