要求焊后热处理的焊件应在热处理前返修。( )
参考答案：对
Susan was reading a newspaper on the train_________ a strange old man come over.
A．when
B．while
C．before
D．after
湿热腰痛失治，日久不愈，兼有伤阴之象者，应加何方治疗
A．二至丸B．六味地黄丸C．一贯煎D．玉女煎E．温胆汤
