【单选题】肌肉细胞可接受来自神经元的神经递质信号 Ach 并引起肌肉收缩(如图所示),但该神经 -- 肌肉突触易受化学因素影响,如:毒扁豆碱可使突触间隙中的 Ach 酯酶失去活性;肉毒杆菌毒素可阻断 Ach 释放;箭毒可与 Ach 受体强力结合,却不能使离子通道开放。上述物质中可导致肌肉松弛的有
【单选题】读者有图书超期时准备借书,应如何处理?()
【判断题】数学、自然科学、思维科学既属于意识形态,又属于社会意识形式。()
【单选题】---Can you shoot that bird at the top of the tree? ---No, it’s out of ________.
【单选题】What can we know about the Department of Education in Britain?
A.
It exercises direct control on the universities.
B.
It takes responsibility for the whole expenditure of the universities.
C.
It scarcely takes the advice of the University Grants Committee.
D.
It has little influence on new developments of the university.
【单选题】读者在借书室外借图书时,发现借阅证尚有超期罚款未处理,应如何处理?()