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it , protect its, to protect it’s , protecting it , to protect
APU发电机 APU发电机、左发（ENG）发电机 APU发电机、右发（ENG）发电机 APU发电机、左ENG发电机、右ENG发电机
are was is will have been
It, of, to This, of, of It, for, to This, for, to
vital, happy important, healthy necessary, health vital, healthy
APU发电机 APU发电机、左发（ENG）发电机 APU发电机、右发（ENG）发电机 APU发电机、左ENG发电机、右ENG发电机
to us to return for us to return to us returning that we had returned
The US economy is gradually recovering from the steep declines. The Fed should take in account the shift in its outlook on economy. It is not the proper timing for the Fed to consider rate interests. It is necessary that the Fed make adjustments to its monetary policy.
lower the production cost hire a better designer improve its quality alter its image
will practise, are will practise, will be practising, being practise, are
推力手柄控制ENG且FCU上的A/THR接通灯亮； 推力手柄控制ENG但FCU上的A/THR接通灯不亮； 推力系统控制ENG但FCU上的A/THR接通灯不亮； 推力系统控制ENG且FCU上的A/THR接通灯亮。
will practise, are will practise, will be practising, being practise, are
两台发动机都是蓝系统 ENG2绿系统，ENG1黄系统 ENG2黄系统，ENGl绿系统 ENG2蓝系统，ENGl绿系统
FMGEC1控制ENG1，FMGEC2控制ENG2； FMGEC1控制ENG2； FMGEC2控制ENG2； D飞行操纵和发动机控制仅由一个FMGEC来控制。
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