下列压实度的检测方法中,( )适用于龄期较长的无机结合稳定类结构层的密度检测。
A. 环刀法
B. 核子法
C. 钻芯法
D. 灌砂法
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路面应具有的基本性能有强度和()、耐候性、抗滑性能、耐久性、()度和尽可能低的扬尘性。
在稳定土施工的过程中,摊铺时宜“宁高勿低”,整平时,宜“宁补勿刮”。
A. 对
B. 错
【单选题】Though secondary education is________,parents are not required to send their children to state schools.
A. compulsive
B. compulsory
C. compulsion
D. compulsing
【单选题】The economic situation has been worsening, causing economists to ________whether the present policies are sustainable.
A. contempt
B. contemporary
C. contemplate
D. contemptuous