急性腹膜炎最重要的体征是
A．剧烈腹痛B．恶心呕吐C．腹膜刺激征阳性D．板状腹E．高热、脉快、大汗
参考答案：C
He says all _______ tried their best and that all that can be done _______ been done.
A．has, has
B．have, have
C．have, has
D．has, have
商业保险包括()。
A.保证保险
B.存款保险
C.财产保险
D.养殖业保险
E.劳动工伤保险
