When working in a confined space where concentrations of harmful substances are very high, why should atmosphere-supplying respirators be worn?
A) To purify air of harmful dust, mist, metal, fumes, and vapors
B) To supply clean breathing air from a compressed air source
C) To enable asphyxiation to occur in a very short time
D) To circulate odorless, tasteless, invisible refrigerants
B
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Two ____ of concrete masonry units are specified by ASTM C90: Type I and Type II.
A. types B. weights C. grades D. standards
After start up, when does profit arrive?
A. Immediately B. Within days of opening C. By the end of the first year there will be significant profits D. It is difficult to predict when a business will earn a profit
In pneumatic control systems, the ____________________ is the device that senses the desired temperatures and relays them to the controller by supplying specific air pressures representing a specific temperature.
Fill in the blank(s) with the appropriate word(s).
The accompanying figure shows the construction of a typical deck. What is feature 3?
A. Joists B. Planking C. Wood posts D. Built-up girder