153.勾缝无脱落，勾缝深度不小于（ ）mm，断道空响处所不超过5％作业验收为合格。
A.1900/1/100:00:00 B.1900/1/200:00:00 C.1900/1/300:00:00 D.1900/1/250:00:00正确答案C
153.勾缝无脱落，勾缝深度不小于（ ）mm，断道空响处所不超过5％作业验收为合格。
A.1900/1/100:00:00 B.1900/1/200:00:00 C.1900/1/300:00:00 D.1900/1/250:00:00正确答案C
