A process is described for preparing 3-pentenenitrile by hydrocyanating 1,3-butadiene, wherein 1,3-butadiene is reacted with hydrogen cyanide in the presence of at least one catalyst and the stream resulting therefrom is purified distillatively, the bottom temperature during the distillation not exceeding 140\xb0 C. When the comparative determination portion determines that passage of a sheet through a reference position is leaded, the sheet conveying speed of the skew feeding correction roller on the same side as that of a sensor which detects the leaded sheet in the two sensors is reduced to correct sheet skew feeding. These multiplexer circuits can be used, for example, as programmable interconnect multiplexers in the interconnect structures of PLDs. A concave container portion is provided in the other end portion of the base body to accommodate a circuit board to mount electric parts.