Examlex
Which of the following is (are) necessary for the synthesis of urea?
On-Delay Nonretentive Timer
An electrical control function that delays the energizing of a circuit for a set period after a signal is received, but does not retain the timing interval in case of power loss.
Retentive Timers
Timers in a PLC that retain their value even after a loss of power or when the controlling signal is turned off.
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