Beams are long, thick pieces of metal or wood used to support - weight in a building., A blueprint is an early design of - a machine or a building., The walls that support all the weight of the building above it are called load-bearing walls and cannot be - knocked down., Aircraft and watercraft use propellers whose blades generate - thrust to move it forward., A conductor is a substance that allows - heat or electricity to pass through it., In some coffee makers, boiling water percolates up - a tube and passes through ground beans., Probes are used to examine the inside of someone or something and record - the collected data., A short circuit causes electrical current to flow along - the wrong route and can interrupt the power supply.,

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