土壤中氡浓度的检测,测量区域范围应于工程地质勘察范围相同。布点数不应少于()个。
A4
B8
C16
D32
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材料中游离甲醛释放量测定的采样体积为()L
A5
B10
C20
D10~20
土壤中氡浓度得测定,每个测试点孔的深度宜为()
A20mm-40mm
B10mm-20mm
C40mm-60mm
D60mm-80mm
甲醛检测的酚试剂分光光度法的测量范围是()
A0.1~1.5g/5ml;V=10L,0.01~0.15mg/m3B
0.2~3.2g/2ml;V=20L,0.02~0.3mg/m3
C1.0~35.0g/10ml;V=10L,0.02~0.7mg/m3
D0.5~10g/2ml;V=20L,0.02~0.3mg/m3
土壤中氡浓度检测,现场取样测试工作不应在雨天进行,如遇雨天,应在雨后()后进行。
A12h
B24h
C48h
D7天