What systems need pneumatic power for operation?
A.A.Air Conditioning, pressurization, wing anti-ice and APU.
B.B.Wing anti-ice, APU and engine starting.
C.C.APU, engine starting, air Conditioning and pressurization
D.D.Engine starting, air conditioning, pressurization, wing & engine anti-ice, hydraulic reservoirs and water tank pressurization.
正确答案是D