文字资料的一个显著特点是()。
A.客观
B.准确
C.庞杂
D.去伪存真
参考答案:D
---He didn’t go to the concert yesterday, did he?
---_______, he was studying for the tests all day.
A.No, he didn’t
B.Yes, he did
C.No, he did
D.Yes, he didn’t
梁式桥支座的作用有哪三条?