A square wave oscillator
A) is a type of relaxation oscillator
B) has two feedback circuits
C) is based on the principle of charging and discharging a capacitor
D) all of the above
D
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The advantage of mercury relays is that each time the relay is used the contact is renewed, eliminating burning and pitting caused by an arc when connection is made or broken.
Answer the following statement true (T) or false (F)
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Daily inspection of an excavation must be performed by a(n) _____
a. qualified person b. competent person c. foreman d. engineer
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For any soil, the bulk density is always lower than the particle density
Indicate whether the statement is true or false
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The cloth produced from flax is:
a. polyester c. satin b. linen d. canvas
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