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%
参考答案：B
—Do:you often see William _ __ _ on the playground?
—No, but he is often seen _____ Chinese kung fu in the park. [ ]
A. run, do
B. run, to do
C. running, do
D. running, to do
考虑架空送电线路钢塔之间的弧垂综合误差应不超过确定的裕度值，一段架空输电线路，其测量视距长度不宜超过( )m。
A．300
B．400
C．500
D．600
