冲击试验是用来测定焊接接头和焊缝金属在受冲击载荷时抗折断的能力。( )
参考答案：错
The disc, digitally _____ in the studio, sounded fantastic at the party that night. [ ]
A. recorded
B. recording
C. to be recorded
D. having recorded
经济地理学的根本特征是（）
A.区域性和实践性
B.区域性和综合性
C.社会性和实践性
D.以上都对
