?A decomposition product of PVC is ____.
A. ?carbon monoxide
B. ?formaldehyde
C. ?HCI
D. ?acetaldehyde
Answer: C
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Most types of concrete slabs that are totally supported by the ground beneath them are _____.
a. monotonous b. lithotropic c. dendritic d. monolithic
Why are many cattle-feeding operations found in grain-producing states?
What will be an ideal response?
Posttensioning of concrete slabs is used to _____
a. reduce the amount of reinforcing steel needed b. shorten the curing time of the concrete c. allow the use of lower-strength concrete d. reduce cracking under heavy load
Ultrasonic leak detectors detect refrigerant leaks by:
A) Seeing the refrigerant by sensing the effect that the leaking refrigerant gas has on sonar. B) Seeing the change in infrared radiation around the area of the leak. C) Seeing the change in ultra-violet radiation around the area of the leak. D) Hearing the high frequency of the escaping gas.