During a normal engine start:

A.A.Only oil quantity and engine vibration are available prior to placing the engine start switch to GND

B.B.Only N1, N2, oil quantity and engine vibration are available prior to placing the engine start switch to GND

C.C.The EEC is not powered until the engine accelerates to a speed greater that 15% N2

D.D.Only round dials are visible for engine indications prior to placing the engine start switch to GND

正确答案是B