单项选择题is a common factor in airline accidents and a small amount of icing or coarse frost can greatly impair the ability of a wing to develop adequate lift.A.WindshearB.IcingC.LightningD.Turbulence
多项选择题原木到场贮存的方法有哪些？ A、干存法 B、湿存法 C、水存法 D、化学保存法
