How is photoperiod regulated in a commercial greenhouse?
What will be an ideal response?
By lighting at night to lengthen the day period or by pulling black cloth over the plants in the day to lengthen the night.
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One disadvantage of the hybrid cycle OTEC is that contamination of seawater with ____ can occur
a. fluorine c. chlorine b. methane d. ammonia
Windshield washer pumps can be damaged if ________
A) Pure water is used in freezing weather B) Ethylene glycol antifreeze is used C) Contaminated windshield washer fluid is used D) All of the above
Technician A says that a wide-band oxygen sensor, also called a lean air-fuel (LAF) sensor, can detect air-fuel ratios from as rich as 10:1 to as lean as 23:1. Technician B says that the oxygen sensor signal determines fuel trim which is used to tailor the air-fuel mixture for the catalytic converter. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
When are shims required when installing a traditional door in relation to the jamb assembly?
A) After jamb assembly B) During jamb assembly C) Before jamb assembly D) N/A — shims are not needed