— _____ are they going?
— To the library. [ ]
A. What
B. When
C. Where
D. Why
答案:C
带风调车作业时,必须执行一关(关折角塞门),二摘(摘软管)、三提钩的作业程序。
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%