再生障碍性贫血主要表现为()
A.出血
B.骨髓造血功能低下
C.全血细胞减少
D.感染综合征
E.贫血
参考答案:A, B, C, D, E
People were not allowed to enter the reading room because it .
A.had been painted
B.was being painted
C.was painting
D.painted
建筑企业的安全生产方针是()
A.加大惩罚力度
B.安全第一,预防为主,综合治理
C.综合治理
D.确保安全