肝破裂的特点是
A．有呕血或黑便
B．肝硬化时发病率较高
C．右肝较左肝多
D．早期即可出现休克
E．腹膜刺激征明显
参考答案：A,B,C,D,E
I have his address, so I did not have any ________ his house.
A. difficulty finding out B. difficulty finding C. difficulty looking for
香农定理描述了( )之间的关系。 Ⅰ 最大传输速率 Ⅱ 信号功率 Ⅲ 功率噪声 Ⅳ 信道带宽
A．Ⅰ、Ⅱ和Ⅲ
B．仅Ⅰ和Ⅱ
C．仅Ⅰ和Ⅲ
D．全部
