【单选题】The letter F in MF and HF stands for ______.
【单选题】I would rather history than geography because I can learn a lot from many historical figures.
【单选题】— Want to have a drink? — No, _____. [ ]
【单选题】肽类激素促使cAMP生成的机制是
D.
激素-受体复合物使G蛋白结合GTP而活化,后者再激活腺苷酸环化酶