Abstract: A composite structure includes a plate-like shear resistance member joined to a surface of a substrate in an erected manner and a concrete-based member formed on the surface of the substrate. The plate-like shear resistance member is embedded in the concrete-based member, and a through hole and a projecting rim portion projecting outside of at least one surface of the plate-like shear resistance member from an inner periphery of the through hole are provided on the plate-like shear resistance member.

Abstract: The heating feeling of an occupant is improved by setting the optimum time for a bi-level mode. A controller (7) switches an outlet mode to a FOOT/FACE mode (bi-level mode) if the water temperature (temperature of engine cooling water) rises to 45.degree. C. or higher in the course of warm-up control, and the necessary blowing temperature TAO is not lower than 100.degree. C. In the FOOT/FACE mode, the setting time (timer time) is variable depending on the outside air temperature and the presence/absence of solar radiation. Specifically, setting is done so that the lower the outside air temperature, the longer the timer time, and the higher the outside air temperature, the shorter the timer time. When solar radiation is present, the timer time is corrected in accordance with the time at which it is judged that solar radiation is present.