以下物品中，（）是不绝缘的。
A.塑料拖鞋
B.棉线手套
C.钉掌皮鞋
D.安全帽
参考答案：C
He __________ well in the exam last week, so he __________ hard now.
A. did, studied
B. didn't, is studying
C. didn't do, is studying
D didn't, studying
已知名义利率为12%，一年计息12次，则半年的实际利率和名义利率分别为( )。
A．6.2%，6%B．12.7%，12%C．5.83%，6.2%D．6.35%，6%
