焊接接头的常见形式有(),(),()和()接头等几种。
参考答案:对接;搭接;角接;T型
-Mary,why didn't you attend the meeting the other day?
-I ___________,but I forgot. [ ]
A. had
B. would
C. was going to
D. did
为了过上美好的生活,我们应该怎样对待自然?()
A.崇拜自然,顺从自然的选择和安排
B.尊重自然规律,开发利用自然
C.最大限度地向自然索取,征服自然