射线探伤对零件内部缺陷进行定性、定量和定位分析的依据是（）.
A.缺陷数据
B.缺陷影像
C.缺陷波形
D.射线衰减程度
参考答案：B
急性胃炎表现为
A．进行性吞咽困难B．上腹痛呈慢性、周期性、节律性C．大量呕吐隔夜食物D．进食污染物后急性呕吐，上腹不适伴腹痛
She knows how to make full use of her time and her parents never put _____ on her to
work hard. [ ]
A. force
B. pressure
C. burden
D. weight
