粪便呈黑色，但隐血试验阴性，见于
A．下消化道出血B．上消化道出血C．服铋剂或铁剂后D．咽喉部出血吞咽后E．以上都不是
参考答案：C
He asked me______. [ ]
A. which floor did I live
B. which floor I lived in
C. which floor I lived on
D. which floor I lived
某土样天然含水量为24%，比重为2.70，重力密度为19kN/m3，该土样的干密度、孔隙比、孔隙率、饱和度为（）。
A. 15.3kN/m3，0.762，43.2%，85%
B. 16.2kN/m3，0.823，42.8%，80%
C. 16.2kN/m3，0.762，43.2%，80%
D. 16.5kN/m3，0.921，46.4%，75%
