—Where are the pens?
—______ on the desk. [ ]
A. They're
B. It's
C. This is
答案:A
将下列各种单质投入或通入CuSO4溶液中,能产生铜单质的是
A.Fe
B.Na
C.H2
D.Ag
巴塞尔协议Ⅲ要求各商业银行应设立“资本防护缓冲资金”,总额不低于银行资产的()
A.2%
B.2.5%
C.3%
D.3.5%