隧道施工缝、伸缩缝和沉降缝渗漏应采取嵌填弹性防水橡胶条、（）及粘贴橡胶止水带等措施进行整治。
参考答案：防水膨胀油膏
Li Lei didn't come to school today. What _______ to him? [ ]
A. was happened
B. happened
C. is happened
D. happening
推行产业政策的成功要点有哪些？
