焊接结构的脆断总是从焊接接头中的缺陷开始。( )
参考答案:对
下述哪种药物是治疗闭塞性细支气管炎伴机化性肺炎的有效药物()
A.色甘酸钠
B.吲哚美辛(消炎痛)
C.顺尔宁
D.泼尼松
E.红霉素
After ________ with the saleswoman, I got the beautiful dress at the price of 50 yuan at last. [ ]
A. debating
B. talking
C. discussing
D. bargaining