零件草图是对装配体中的每一个零件进行的测绘工作。（）
A. 对
B. 错
零件草图首要的工作是根据零件结构进行视图的选择。
A. 对
B. 错
1. What do futurists dream of?
A. Owning a personal airplane.
B. Attending to the duties of a pilot.
C. Making planes with automatic piloting
D. Flying an airplane by themselves.
2. What is the main characteristic of the new kind of traveler?
A. They have considerable interest in learning to fly.
B. They like owning and lying a personal airplane
C. They like to speak to the flight computer.
D. They want to fly an airplane with minimal efforts.
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