A pressure relief cap engageable with a container includes a vent passage between an interior of the cap and an exterior of the cap. The first operation unit includes a display device and a control CPU. When fragmentation of a multicast frame is allowed, the value of a fragment number of the multicast frame may be also used, and if it includes a traffic ID, the value of the traffic ID can be also used for determining whether or not the multicast frame is a duplicated frame. The foil encloses an area across the connected ends. When delivered at the proper dosage the pharmaceutical composition provides therapeutic activity similar to that of the parent active agent. The learned-correction value is used to compensate a throttle position.