Figure 4-7 
-What do most studies indicate that tobacco and marijuana tend to be?
Definitions:
Mechanical Linkage
A series of rigid links connected with joints to form a closed chain, or an open chain, which can transmit motion and forces from one point to another.
Circuit Wiring
The interconnected path through which electrical current flows to perform a specific function.
Electrical Circuits
Networks of electrical components connected together to allow the flow of electrical current in a complete path.
Control Coils
Electromagnetic coils used in relay and contactor units to create a magnetic field that actuates the device.
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