柴油机喷油器针阀在开启位置卡住会引起（）
A、燃油敲缸
B、机械敲缸
C、不做功
参考答案：A
Pirates of the Caribbean is one of ___ films that I have ever seen.[ ]
A. very exciting
B. more exciting
C. much more exciting
D. the most exciting
静态RAM的特点是。
A．工作时存储内容不变
B．不需刷新
C．不需电源提供电流
D．断电后存储内容不变
