绞窄性肠梗阻的腹痛特点是（）。
A.阵发行绞痛
B.持续性顿痛
C.持续剧烈腹痛
D.放射性腹痛
E.持续性隐痛，阵发性胀痛
参考答案：C
--- Come on, please give me some ideas about the project.
--- With so much work ________ my mind, I’ll almost________.
A．filling; break up
B．filled; break out
C．filled; break off
D．filling; break down
冲击试验可以测定焊接接头或焊缝金属的断面收缩率。
