根据《重大危险源辨识》标准,与重大危险源有关的物质种类包括以下那些。______
A.爆炸性物质 B.易燃物质 C.腐蚀性物质 D.有毒物质
参考答案:A,B,D
-- What a day! It's mining again. We can't go hiking tomorrow.
-- Don' t worry. It won't __________ long.
A.drop
B.rain
C.go
D.last
患者26岁,停经11周, * * 少量出血1周。宫底耻骨上3横指,尿妊娠试验阳性。下述哪项检查最有助于鉴别诊断()
A.诊断性刮宫
B.盆腔B超
C.胸片
D.头部CT
E.血hCG定量检查