弹簧是弹性元件，能产生较大的弹性变形，所以采用低碳钢丝制造。
参考答案：错
I _____ some of my free time playing basketball for my school team. [ ]
A. spend
B. cost
C. take
D. pay
B-5277当飞机座舱高度在4200米时，氧气面罩会自动脱落。（）
