technician a says symbols are used to represent components in electrical wiring components. technician b says components often look different from one manufacturer to another. who is correct

Apressure vessel with an r/t 20 cannot be treated as thin walled vessel. a)-trune b)- false

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.

List and describe the attached tools in boxford cnc milling machine? and how many tools were used in your projects explain them?