Which of the following types of steel can have on average up to 1/2 percent (0.25-0.55%) copper content? A. structural steel, B. alloy steel, C. weathering steel, D. stainless steel
C. is correct.
Weathering steel, also known under the trade name COR-TEN, develops a stable rust-like appearance after exposure for several years. are-review.blogspot.com
Which of the following detector types can detect smoke or a smoldering fire that has not yet burst into flames? A. Ionization B. Rise-of-temperature C. Photoelectric D. Flame detectors
good test question
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