A method used to detect leaks in green roofs that does not involve the removing of sections of green roof plant materials and their containment is ______________
A. sonic testing
B. x-ray testing
C. electric field vector mapping
D. all of the above
C
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In a fuel cell, the _____________ isolates the reactions between anode and cathode, not allowing the electrons to pass, but allowing the ions to pass.
Fill in the blank(s) with the appropriate word(s).
What type of sensor is used as a height sensor on vehicles equipped with an electronically controlled suspension?
A) Photo cell B) Hall-effect C) Potentiometer D) All of the above
How does a waste-spark ignition system fire the spark plugs?
A) The same plug always is fired with straight or reverse polarity. B) The polarity reverses at each firing (flip flops). C) The waste spark is sent to the cylinder next to the cylinder being fired. D) Both A and C
Occasionally, a particular logic expression will be of no consequence in the operation of a circuit, such as in a BCD-to-decimal converter. These result in ________ terms in the K-map and can be treated as either ________ or ________
A) spurious, ANDs, ORs, B) spurious, 1s, 0s, C) duplicate, 1s, 0s, D) don't care, 1s, 0s,