Which of the following can be used as directional control valves?

A. check
B. pilot
C. spool
D. all of the above


Answer: D

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Tattooing them on the inside of the upper lip can permanently identify horses

Indicate whether this statement is true or false.

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Biodiesel can be obtained from:

a. fossil fuels c. rapeseed and sunflower seeds b. oil reserves d. legumes and grasses

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Frequency used in communications is measured in ________, which represents the number of cycles per second

Fill in the blank(s) with correct word

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A resistor with orange, orange, red and gold bands has a value and tolerance of ________

A) 3.3 k? ±5% B) 3.3 k? ±10% C) 33 k? ±10% D) 33 k? ±5%

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