____ are so named since they were designed to perform arithmetic calculations such as addition and multiplication.
A. Transistors
B. Inverters
C. Opamps
D. 555-timers
Answer: C
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In a roof with a ridge beam,
A) ceiling joists are spaced at 24 in. on center maximum. B) ceiling joists are spaced at 16 in. on center maximum. C) ceiling joists are spaced at 12 in. on center maximum. D) none of the above.
Which frequency is a harmonic of 60 Hz?
A. 10 Hz B. 30 Hz C. 90 Hz D. 180 Hz
Forest fires result from the rapid combination of ____ with other chemicals contained in wood, leaves, and other material in the forest
A) water B) heat C) fuel D) oxygen
In recent years, a soil test for nitrogen has been developed and widely used in humid regions in predicting how much nitrogen will need to be applied to supplement natural mineralization in the soil. This test is called the:
A) diagnosis and recommendation integrated system (DRIS). B) pre-sidedress nitrate test (PSNT). C) soil nitrogen partial analysis (SNPA). D) Differential Nitrate Extraction Test (DNET). E) Mehlich II nitrogen test.