普萘洛尔主要阻断
A．β受体B．α受体C．N2胆碱受体D．N1胆碱受体E．M胆碱受体
参考答案：A
No matter ____ he is, he must ____ and don't use his cell phones in the class. [ ]
A. what; obey the rules
B. who; obey the rules
C. that; obey the rule
D. where; obey the rule
急性阑尾炎的主要症状是
A．畏寒、发热B．恶心、呕吐C．腹泻或便秘D．转移性右下腹痛E．食欲下降
