In the accompanying figure, the item identified as number 1 represents the symbol for a ____.
A. contour flush
B. weld all around
C. melt through
D. field weld
Answer: D
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The ____ permits the use of intrinsically safe systems in areas that contain hazardous vapors.
a. NEMA b. NEC c. IEEE d. UL
The term xEV refers to any form of electric vehicle, including battery electric and fuel cell electric vehicles. These are also known as ____________________ because they produce no regulated exhaust emissions from the tailpipe.
Fill in the blank(s) with the appropriate word(s).
A vigorously growing crop that is used to suppress weeds is called a:
a. smother crop c. stifle crop b. rotational crop d. transitional crop
Determine the central angle that cuts off an arc of 22.5 inches on a circle with a 21.0 inch radius. Express the answer to 1 decimal places and use 
= 3.14.
Fill in the blank(s) with the appropriate word(s).