吗啡主要用于
A．分娩镇痛
B．慢性钝痛
C．胃肠绞痛
D．肾区痛
E．急性锐痛
参考答案：E
The new bridge in Wenchuan ____ last month. Now it's easy to go to the city center.[ ]
A. built
B. was built
C. has been built
D. were built
材料费控制按“量价分离”原则，其中对钢钉、钢丝等采取( )。
A．定额控制 B．包干控制 C．指标控制 D．计量控制
