3. A subsystem is to a system as a(n) _____________ is to a refrigerator.

A.

food product

B.

door

C.

electrical outlet

D.

cooling element



4.The author uses the example of the flameless candle to illustrate that

A.

engineering makes products safer.

B.

elements of nature are easy to replicate.

C.

there are many elements within a system.

D.

products of engineering often become household objects.



5. In some cases, inputs can be changed into outputs.

A.

True

B.

False