四大美女中的貂婵，她挑起引发了（）和（）的矛盾。
参考答案：董卓，吕布
The plan to be carried out next month needs________among the members of the labor union before________.
A．to discuss；carrying out
B．to be discussed；carried out
C．discussing；being carried out
D．discussed；to be carried out
下列对超声诊断仪的维护保养，哪项是错误的
A．防尘B．防潮C．自行拆卸机器D．防高温E．减少震动
