103型分配放风阀部由放风阀盖、（）、放风阀导向杆、橡胶密封圈、夹心阀等组成。
A.紧急活塞
B.放风阀弹簧
C.局减活塞
D.稳定杆
参考答案：B
Little _____ about her own safety, though she was in great danger herself. [ ]
A. did Rose care
B. Rose did care
C. Rose does care
D. does Rose care
下列反应属于吸热反应的是
A．镁条与盐酸反应
B．甲烷燃烧
C．生石灰与水反应
D．高温锻烧石灰石
