阿托品能阻滞________受体,属________类药。
参考答案:M胆碱|抗胆碱
This is ________ difficult problem that few students can work it out. [ ]
A. so
B. so a
C. such
D. such a
吴三桂最后:()
A、战死
B、病死
C、老死
D、自杀