A torque control circuit includes a motor driving circuit, a motor operating current detection circuit, a reference voltage generation circuit, a maximum motor current setting circuit, a torque setting circuit, an information output circuit, a regulated-voltage power supply circuit, a motor operating temperature detection circuit, and a control circuit. The boron carbide ceramics include amorphous boron, amorphous carbon, and Al2O3 powder as a sintering aid. The first mechanical energy source can be configured to contract the lower post and the upper post. The attachment fitting is connectable to a side sill at a moment connection. The fruit is uniformly medium in size, mostly red with greenish yellow freckling in skin color, clingstone in type, oblate in shape, red in flesh color, very firm and crisp in texture, and outstanding in flavor. A thresholding unit generates a binary image which only contains those reliefs having heights above a threshold value.