What phytophotodermatitis caused by?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

7types of electromagnetic waves from lowest to highest frequency