In a typical concrete mix, 10 to 15 percent of the volume is _____.
a. water
b. aggregate
c. admixtures
d. portland cement
d. portland cement
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Referring to the following figure, the mirror heat does not function on either side of the truck, but the back-up lamps illuminate with the transmission in reverse. Which is the least likely cause of the inoperative mirror heat?
A. Both of the mirror heat ground circuits are open. B. The mirror heat switch is defective. C. There is an open circuit between the fuse and the mirror heat switch. D. There is an open circuit between the switch and the splice in the wiring harness where the left and right side mirror heat circuits separate.
Legumes can fix atmospheric nitrogen to ammonia and nitrate, and then incorporate them into amino acids
Indicate whether the statement is true or false
Open display cases are designed:
A) To pull down warm products to refrigerated temperatures. B) To keep product at the same temperature at which it enters the case. C) To freeze liquid products in less than an hour. D) To display products that do not need refrigerating.
A resonant circuit with a high Q ________
A) has no pass-band B) tunes sharply C) has a small voltage across the capacitor D) has a very wide pass-band