按规定，在高速公路及一级公路填石路堤路床顶面以下50cm范围内，填料粒径不得大于（）。
A. 10cm
B. 20cm
C. 30cm
D. 50cm
查看答案
在爆破技术的分类中，( )属于洞室爆破。
A. 光面爆破
B. 微差爆破
C. 预裂爆破
D. 抛掷爆破
Which statement is right according to the passage
A. We don' t need person - to - person selling any more.
B. Since the Industrial Revolution, person -to -person selling disappeared.
C. Advertising pays for about two thirds of the cost of the programs on commercial television and radio.
D. Advertise on commerical television and radio is more expensive than on magazines and newspapers.
在对强夯施工后的石质路基的表层松动时，采用( )进行压实。
A. 倾填
B. 振动碾压法
C. 横向压实法
D. 竖向填筑法
当路堤原地基横坡陡于1:5时，原地基应挖成台阶，台阶宽度一般不小于( )m。
A. 0.8
B. 1.0
C. 1.2
D. 1.4
微信支付 
支付宝支付