A pneumatic valve is defined as a 5/3-way valve. What do the numbers 5/3 mean in this definition?
a) The valve has 5 ports and 3 switching positions.
Ob) The valve has 5 switching positions and 3 ports.
O
c) The valve has 5 ports for work conductions and a neutral position.
O
d) The valve has a neutral position and 4 other switching positions.
O
e) The valve has a port for the exhaust.

Which best describes the condition under which the unicode output is the same as plain text?

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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