就全社会而言,一切经济单位都可能面临冲突、火灾和车祸风险,这说明风险具有()。
A.可变性
B.偶然性
C.客观性
D.多发性
参考答案:C
The mother, as well as her two daughters, ____ to the theatre with some friends this evening.
A.are going
B.were going
C.is going
D.was going
火焰传感器性能指标应符合GB()或GB12791的相应规定。
A、15631
B、15632
C、15633
D、15634