1.在新型飞机研制中,将飞机放在风洞中固定不动,让模拟气流迎面吹来,便可以模拟空中的飞行情况.此时,机舱里的飞行员感觉飞机在飞行,则他所选的参照物是( ) (A)飞机.(B)模拟气流. (C)地面.(D)他本人. 2.人体的运动系统相当复杂,但最基本的运动形式是,骨骼在肌肉提供的动力作用下绕关节转动.如图1所示是手端起 1. In the development of a new type of aircraft, the aircraft is placed in a wind tunnel and kept stationary so that the simulated air current can be blown in and it can simulate the flight conditions in the sky. At this time, the pilot in the aircraft cabin feels that the aircraft is flying. The reference is () (A) the aircraft. (B) the simulated airflow. (C) the ground. (D) himself. 2. The body’s movement system is quite complex, but the most basic form of exercise is that the bones are provided in muscles. Under the effect of power around the joint rotation. As shown in Figure 1 is a hand from the end