A set of are installed to control the speed and direction of the vehicle. A: wheels B: gears C: gea D: wheel

To survive in the intense market competition, we must____the qualities and varieties of products we make to the world-market demand. A: improve B: guarantee C: gea D: enhance

Lesson 16 听力选择-5 [音频] A: The runway is occupied by the landing aircraft which encountered burst tire B: The runway is covered with a lot of debris C: The departing aircraft is rejecting takeoff due tire blow-out D: CCA4106 is unable to extend the right main gea