钻杆母扣镗孔处有轻微碰击变形者不能使用。
参考答案：对
The house price is going up _______.
A．year and year
B．year after year
C．year to year
D．year by year
我国的《公路沥青路面再生技术规范》建议水泥等活性填料一般不超过（）
A.1%
B.1.5%
C.2%
D.2.5%
