钢筋冷拉伸长率检验，调直后不得有裂纹和局部颈缩，表面擦痕超过钢筋截面的（）时，该段钢筋不得使用。
A、5%
B、7%
C、9%
D、11%
参考答案：A
填空题。
1. The question is so hard that _______students can answer it. (用a few或few填空)
2. —Is the new rule working?
—Yes, ______books are stolen (被偷). (用ra few或few填空)
3. Don't worry, we still have ______minutes left. (用a few或few填空)
4. There are so ______trees on the hill. The birds can't even find a place as thei home.
(用a few或few填空)
适用于各级公路粒料类基层和底基层的是( )。
A．泥结碎石 B．泥灰结碎石C．级配碎石 D．级配砾石
