我市乡镇煤矿特种作业人员主要有哪几类？（例举5类以上）
参考答案：瓦检工、安监工、放炮工、绞车工、抽风机司机、信号工、瓦斯监控工、井下电钳工等。
The patient says he dreads ______ neighbors to carry him and his wheelchair up the stairs to his tenth-floor apartment when the elevator goes out.
A．asking
B．to ask
C．being asked
D．to be asked
若内存按字节编址，用存储容量为4Kb×8的存储器芯片构成地址编号8000H至FFFFH的内存空间，则至少需要（）片。
A.4
B.6
C.8
D.10
