抗休克的最基本治疗措施是（）。
A.应用血管活性药物
B.扩充血容量
C.纠正酸中毒
D.增强心功能
参考答案：B
Luckily, the old man was sent to the hospital in time. Three minutes later and he _______.
A．would die
B．was to die
C．should have died
D．would have died
MD5是一种（）算法。
A.共享密钥
B.公开密钥
C.报文摘要
D.访问控制
