称重电控柜的防护等级是()。
A.IP65
B.IP60
C.IP70
D.IP80
参考答案:A
I was greatly impressed __________ the speech by the mayor of Shanghai before the final voting for EXPO 2010.
A.to
B.over
C.with
D.on
“一元化领导”是指()。
A.首长制
B.层级制
C.完整制
D.分离制