Which products of combustion are toxic?
A. carbon dioxide
B. aldehydes
C. carbon monoxide
D. both a and c
E. both b and c
Answer: E
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One-way solid slabs span parallel lines of support formed by _____.
a. beams or walls b. reinforcement c. columns d. footings
Which of the following statements reflects what we know about the grapevine?
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Sumer was at the mercy of its
a. high mountains. b. deadly monsoons. c. swampy hinterland. d. great rivers.