原状地基为岩石或坚硬土层时，管道下方应铺设砂垫层，对于小于等于500mm的柔性管道，其厚度应大于（）mm。 ["50","100","150","200"]
You have 100 segments in the USERS tablespace. You realize that the USERS tablespace is running low on space. You can use Segment Advisor to（）. ["add data files to the tablespace ","identify the segments that you should shrink ","modify the storage parameters for the tablespace ","automatically shrink the segments with unused space ","check the alerts generated for the tablespace that is running low on space"]
人民警察询问被侵害人或者其他证人，（）。 ["可以到其所在单位或者住处进行","必须到其所在单位进行","应当到其单位或者住所进行","必要时，也可以通知其到公安机关提供证言"]
灌注混凝土拌合物应有良好的和易性，应保持足够的流动性，其坍落度应为（）mm。 ["A.150～180 ","B.160～200 ","C.180～220 ","D.180～200"]
采煤机的割煤方式有哪些？（） ["双向割煤，往返一刀","“∞”字形割煤，往返一刀","单向割煤，往返一刀","双向割煤，往返二刀"]
在Windows中，有些菜单选项的右端有一个向右的箭头，其意思是（），菜单中灰色的命令项代表的意思是（）。
