在钢结构工程中，对于C级螺栓，螺栓孔应是( )。
A．Ⅰ类孔
B．Ⅱ类孔
C．Ⅲ类孔
D．Ⅳ类孔
参考答案：B
Measures _______ to raise the employees’ salaries if the prices are rising all the time.
A．had been taken
B．have been taken
C．will be taken
D．were taken
铁路行车时刻是如何规定的？
