A memory system including a non-volatile flash memory and a method for simultaneously selecting a plurality of memory blocks are disclosed. There are EP_type and EP_map type in CPI_type. The nonmetallic sleeve is coaxial with the hollow tubular portion in a region where the hollow tubular portion and the nonmetallic sleeve are joined to each other. The collapsed air cell grips the piston thereby immobilizing the air spring. In a PMOS transistor, a channel in which positive holes travel, is formed with the use of a discontinuous portion of a valence band at the interface between the SiGe and Si layers. Alignment tabs are provided on the sidewalls of the electrical box to enable easy alignment against a stud in either a new work or retrofit situation.