蝎子的毒刺长在哪？

A. 主空气活门
B. PRSOV
C. 混合活门
D. A和B

A. 飞灰
B. 二碳酸钠
C. 滑石粉
D. 氢氧化钠

A. a request for assistance
B. the location of the unit at the time of the casualty
C. an estimate of the cost to repair damages
D. the amount of fuel remaining