英语翻译1.Metal cutting tools must possess a variety of differen

英语翻译
1.Metal cutting tools must possess a variety of different properties in order to cut the different metals under varying conditions of severity.To meet these demands,tools have been produced from a variety of materials.
2.The basic concept of injection molding revolves around the ability of a thermoplastic material to be softened by heat and to harden when cooled.
3.One of the newest developments in electricity is the transistor.A transistor is called a semiconductor because under one set of conditions it not allow current to pass through,but under other conditions it will.
4.The resistance (电阻) of any conductor (导体) depends not alone on the material of which it is made.It depends also on how long and how big the conductor is.
5.The total (总) resistance of a series (系列) circuit (电路) is equal (均等) to the sum (总和) of all the resistances in the circuit.In circuits where short connecting (连接) wires (导线) are used,the resistance of the wires is not important in finding the total resistance.
6.control the operations of a manufacturing plant through either direct or indirect computer interface (接口) with the plant’s Computer-aided manufacturing (CAM) can be defined as the use of computer systems to plan,manage and resources.
7.During the design process,an engineer records ideas by means of sketches and design of prototypes and their development.
8.Jigs and fixtures are alike in that both incorporate.Devices to ensure that the work piece is correctly located and clamped,but they differ in that jigs incorporate means of tool guiding the actual cutting operation,and fixtures do not
9.Computer aided design (CAD) can be defined as the use of computer systems to assist in the creation modification,analysis or optimization of design.
如果可以的话,顺道解释分析下,