?What is the possible problem with erasing a pencil mark with most pencil erasers?
A. ?They are too small to do a good job erasing lines.
B. ?They have an abrasive action that can rough up the top of the paper.
C. ?They have a sharp metal ring that can cut or tear the paper.
D. ?All of the above
Answer: D
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a. filoplumes b. semiplumes c. rectrices d. remiges
Assume an insulated vessel has a circumference of 62' (18.9 m) and a tan-tan height of 33'– 9" (10.3 m). There will be 8 sections per course with 3" (8 cm) overlaps at the seams. Estimate the total number of 48" (1.22 m) roll jacket sections needed to cover the sidewall.
a. 32 b. 48 c. 72 d. 96
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a. inching b. throttling c. stepping d. plugging