焊接接头同一部位的返修次数不宜超过3次，超过3次以上的返修，应经技术总负责人批准，并记录在设备资料中。
参考答案：错
We don’t think the experiment is ___ failure. At least we have gained ___ experience for future success.
A．the; a
B．a; /
C．a; an
D．the; the
