产后正常血性恶露持续天数为
A．2天
B．3～4天
C．2～3周
D．2周左右
E．以上都不是
参考答案：B
Many people hope to have a _____ job, especially during the financial crisis.
A．professional
B．premier
C．primitive
D．permanent
混凝土基础的刚性角应控制在( )。
A．45°以内B．45°以外C．26°～45°D．33°～45°
