人造卫星轨迹计算主要涉及计算机应用中的（）。
A.科学计算
B.辅助设计
C.过程控制
D.人工智能
参考答案：A
—What's the price of the shirt?
—Two hundred dollars.
—I'm afraid ________.
A．the money is too much
B．the price is too expensive
C．the price is too high
D．your offer is too dear
试述机车燃油系统原理
