Using bales of straw to construct buildings began in the _____ .?
A. ?20th century as a means of creating long-lasting green construction?
B. ?late 1800s on the prairies of Nebraska as an alternative to sod houses?
C. ?18th century by Native Americans being pushed west?
D. ?early 1700s in the North American colonies when settlers could not find other sources of building materials?
Answer: B
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Indicate whether the statement is true or false.
A good source of material to make biodiesel is _____
a. rotten vegetables c. used engine oil b. old frying oil d. dead animals
The evaporative emissions system reduces the emissions of HC vapors into the atmosphere when the vehicle:
A. is operating at highway speeds B. is stationary and the engine is idling C. is parked with the engine off D. all of the above
An amplifier that is biased so that the output current flows for only half of the input cycle is operating as a ____ amplifier.
A. class A B. class AB C. class B D. class C