A transistor is made by joining how many layers of semiconductor material?
a. Two
b. Three
c. Four
d. Five
b. Three
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The IECC has mandatory and non-mandatory provisions. The non-mandatory provisions can be complied with using three alternative paths, while the mandatory provisions must be complied with as given in IECC. Name the three alternative, non-mandatory paths.
What will be an ideal response?
A standard respirator with a HEPA filter can be used for very short exposure to fumes from welding _____
a. zinc or copper b. stainless steel c. high-carbon steel d. titanium
The law of conservation of matter states that:
A) Only "green" matter should be used for installing HVACR systems. B) Matter cannot be created or destroyed. C) Matter should not be wasted. D) An equal amount of matter is always created somewhere whenever matter is destroyed.
In the safe distance formula (Ds = K x (Ts + Tc + Tr + Tbm) + Dpf), the letter K is the hand speed constant
Indicate whether the statement is true or false