The present invention relates to automated methods of introducing multiple nucleic acid sequences into one or more target cells. Such interchangeability greatly expands the utility of the electron device in scientific and industrial applications, besides addressing such issues as wear and tear, restoration and upgrading of performance, of the device internal components, it provides the ability to match the device output energy and power to a wide variety of scientific and practical applications. Besides, in contradistinction with the present boilers, the water-tubes are straight and of high thermal conductivity. in measurement in accordance with ASTM D3418; and the ratio of the block copolymer is 10% by mass or more when the sum of the block copolymer and the polymer is taken as 100% by mass. The second amount is added to the first amount in accordance with the clocked time period, in order to obtain the total amount.