The present invention relates to novel photoresist compositions and processes for preparing the same utilizing polymers having a low polydispersity via the use of certain chain transfer agents with certain monomers to provide said polymers. Each of the first to third lenses L1 to L3 is configured as a positive meniscus lens of which convex surface is opposed to the object. The invention also provides methods and compositions for assaying compounds which increase or decrease potassium ion flux through a calcium-activated potassium channel. The joint configuration of the two-measuring devices for measuring the critical dimension of a feature allows a mostly contamination-free, rapid, and flexible exchange between the two measuring devices, and furthermore the measuring of lots can be planned in accordance with various measuring strategies. Whether or not a wiring conductor conducting to a gate electrode becomes an antenna ratio exceeding an allowed antenna ratio in the semiconductor device is determined by determination means 514 and if the wiring conductor exceeds the allowable antenna ratio, one or more repeater cells are inserted into any point of the wiring conductor by selection means 515. An ejection element conveys the compressed bundle out of the holding area.