Is this sentence right？ The factory machined very well.

The brazing weld need annealing heat treatment so that it is easily machined.。（ ）

Cast iron carrier rings， （） machined grooves， are provided for all the pistons.

Cylinder block or engine block is actually a complex machined casting unit.

The brazing weld need annealing heat treatment so that it is easily machined. A: 正确 B: 错误

Which of the following features are machined technical features? A: Bosses B: Chamfers C: Relief grooves D: Casting corners E: Tool recesses

Lubrication A: is the process or technique of reducing wear between surfaces by using a lubricant between the surfaces. B: is a special liquid that performs three main functions during machining. It lubricates the cutting action, carries off the heat generated, and flushes(冲洗) the chips(切削). C: is the material being machined. It can be any material and any shape. In the machine shop it usually refers to round or flat pieces of metal ready to be machined.

The dimension of the cutting layer measured along the machined surface is called （ ） A: cutting depth B: cutting length C: cutting width D: cutting thickness

When manufacturing involute standard spur gears with generating cutting method, methods to avoid undercutting include A: Reduce the tooth height of the tool knife B: Increase the number of teeth of the machined gear C: Moves the cutter away from the gear under machining D: None of the above