Where did the “velvet revolution” take place?

a. Czechoslovakia
b. Hungary
c. Poland
d. East Germany


a. Czechoslovakia

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____________________ can be described as the amount of oxygen per given volume of space, or in other words, the thickness of air.

Fill in the blank(s) with the appropriate word(s).

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Young children in kindergarten are taught to wash their hands with a ____ wash with both soap and water

a. 10-second c. 30-second b. 20-second d. 60-second

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Which type of regenerative braking system uses an electro-hydraulic system?

A) Parallel B) Series C) Both Series and parallel D) Neither series nor parallel

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The severity of water quench sometimes causes:

A) One inch thick sections to harden clear through B) Distortion and cracking C) Bubbles to form inside the steel D) Lack of hardening in W1 steels

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