The ____ operator of the test command, combines two expressions and tests a logical OR relationship between them.

A. |
B. ||
C. -O
D. -o


Answer: D

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During a busy hour, the number of calls per hour for each of the 12 cells of a cellular cluster is 2220, 1900, 4000, 1100, 1000, 1200, 1800, 2100, 2000, 1580, 1800 and 900. Assume that 75% of the car phones in this cluster are used during this period and that one call is made per phone.

(a) Find the number of customers in the system. (b) Assuming the average hold time of 60 seconds, what is the total Erlang value of the system? (c) Find the reuse distance D if R = 5 km.

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The volume V of a cube is given by the formula V = s3, where s is the side length. Find the volume of a cube with side length 0.36 inches. Round your answer to the nearest thousandth cubic inch.

A. 0.467 B. 0.046 C. 0.004 D. 0.047

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Lettering at an angle from ____ degrees is practical, as it is easy to read and produce.

A. 30 to 45 B. 60 to 75 C. 60 to 80 D. 70 to 90

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What is the standard door height for residential work?

A) 76" B) 84" C) 80" D) 72"

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