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单选题
在什么时候提起油门杆至慢车位为发动机起动提供燃油What time the thrust levers are advanced to the idle position to turn the fuel on.
A
当N2 rpm超过10%的时候When the engine has accelerated to 10% N2 rpm,
B
当N2 rpm超过20%的时候When the engine has accelerated to 20% N2 rpm,
C
当N2 rpm超过30%的时候When the engine has accelerated to 30% N2 rpm,
D
当N2 rpm超过40%的时候When the engine has accelerated to 40% N2 rpm,
答案解析
正确答案：B
