Which of the following is not one of the main methods of membrane desalination?
A) reverse osmosis
B) electrodialysis
C) contact
D) none of these
C
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____________________ stations are spring-controlled switches, which, when pushed, are used to complete motor or motor control circuits.
Fill in the blank(s) with the appropriate word(s).
Installing nail-on device boxes, panelboards, and lighting fixtures in new houses are tasks performed by _____.
a. commercial electricians b. electrical maintenance technicians c. industrial electricians d. residential electricians
A farmer is the custodian of much of our nation's most important natural resource: our land and its thin soil covering
Indicate whether the statement is true or false
Performance flywheels are usually made of nodular cast iron.
Answer the following statement true (T) or false (F)