公安工作既有鲜明的阶级性，又有广泛的社会性。 ( )
参考答案：对
-- You ought to have given them some advice.
--- , but who cared what I asked?
A．I ought to
B．So I ought
C．So it was
D．So I did
不带夹套的外压容器应如何进行耐压试验？
