Urine consists solely of water and urea or uric acid
Indicate whether the statement is true or false
F
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Steam turbine engines were an important development in the late 1800s because ____
a. they operated with a low pressure system that was safer than what was used before b. their spinning action was almost soundless c. they allowed boats to travel at speeds over 100 knots d. they became the main source of electricity production in the U.S.
According to the UN, an African country that historically provided 100 percent of the population's food needs now provides:
A. 50 percent B. 60 percent C. 70 percent D. 80 percent
The process of combustion occurring without an open flame is called _________
A) Cold fusion B) Non-flame combustion C) Direct ignition D) Spontaneous combustion
Older engines that use flat-bottom lifters should use oil (or an additive) that has enough ________
A) Viscosity B) Diesters C) Polyalpholefin (POA) D) ZDDP (zinc)