A. 胆汁质 B. 多血质 C. 粘液质 D. 抑郁质
A. 气环和油环 B. 油环 C. 气环
A. 过盈 B. 间隙 C. 过渡
A. 减振 B. 过载保护 C. 缓冲
A. are B. is C. were D. was