压力容器按照压力、介质危害程度分为()。
A.第一类压力容器
B.第二类压力容器
C.第三类压力容器
D.第四类压力容器
参考答案:A, B, C
28.You can ask him again if you like,but it won’t make any __________he will still say no.
A.point
B.use
C.result
D.Difference
17.——Honey, please don’t play the computer games.
——Pardon ?
——I ______ play the computer games.
A.ask you don’t
B.asked you not to
C.tell you not to
D.told you didn’t