液压系统主要由（）元件、（）元件、（）元件、（）元件、（）等五部分组成。
参考答案：动力；执行；控制；辅助；液压油
Nick _____ a job in a bank, but to our surprise, he didn't take it.[ ]
A. is offered
B. offered
C. was offered
D. has offered
晶体管的功率为（）
