One of the Oldest Devices Used for Calculation Is the Abacus

question 100

Multiple Choice

One of the oldest devices used for calculation is the abacus, as shown in the sample figure. Each rod names one of the positions we use in counting. Each bead on the bottom represents one unit in that column and each bead on the top represents 5 units in that column. The number illustrated in the sample figure below is 1,734. ​
Sample ​
Choose an abacus to show 10,905.
​
A B ​
​
C D ​

• A) C
• B) B
• C) D
• D) A
• E) none of these

Understand the routing of secondary circuit signal air in trailer service signal circuits and identify responsible valves.

Recognize which parts of the brake system are actuated by the secondary circuit in a tandem drive axle, air brake-equipped tractor.

Understand the components of a truck wheel assembly and their proper installation.

Identify best practices for maintaining and servicing truck wheel components.

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