注浆地基施工结束后，应检查注浆体强度、承载力等。检查孔数为总量的2％-5％，如果不合格率大于或等于20％时怎么办？
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控制室、开关室、计算机室等通往（）等处的所有电缆孔洞和盘面之间的缝隙（含电缆穿墙套管与电缆之间缝隙）必须采用合格的不燃或阻燃材料封堵。
A. 电缆夹层、隧道
B. 穿越楼板
C. 墙壁
D. 控制柜、盘
Before the sludge in a purifier is ejected,（）
A. the oil feeding is stopped and replaced by admitting flushing water
B. the flushing water feeding is stopped and replaced by admitting oil
C. the feeding of dirty oil and flushing water is stopped
D. the feeding of dirty oil and flushing water is admitted
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