pSS患者出现高丙球蛋白血症的几率是()
A.50%
B.90%
C.70%
D.60%
E.80%
参考答案:B
安全生产的要素有()
A.安全生产文化
B.安全生产法制
C.安全生产责任制
D.安全生产科技
E.安全生产投入
——-We had a good time in dancing at a disco, why didn't you go with us?
——-I ________ there, but my parents didn't let me go.
A.couldn't go
B.failed to go
C.hadn't gone
D.would have gone