政府进行金融监管的理论依据的核心假定是()
A.政府失灵
B.市场竞争
C.金融市场失灵
D.混业经营
参考答案:C
We found that this pair of sun-glasses couldn't the sun. [ ]
A. keep in
B. keep out
C. keep away
当注入气体中氧气的体积分数为5%时,燃烧气硫化氢的体积分数大于或等于()就达到了起爆极限。
A、2.5%
B、5%
C、7.5%
D、lO%