AD289当屏幕显示L代码时为（）
A.耗材寿命到期
B.保养计数器
C.图像处理问题
D.粉瓶碳粉量少
参考答案：A
He and his mother ______ at home last night. [ ]
A. are
B. is
C. was
D. were
诺西BSC3i中负责管理GSW2KB的单元是：（）
A、MCMU
B、BCSU
C、OMU
D、PCU
