单项选择题
A.1000mm B.2100mm C.900mm D.1500mm
A.150mm B.100mm C.160mm D.170mm
A.橡胶锤 B.墙内管路探测仪 C.边开孔边检查 D.瓷砖空鼓锤
A.清洗剂腐蚀 B.釉面不合格 C.坐便器安装倾斜 D.自来水含碱量偏高
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