An __________ is the lowest percentage of a substance in air which will burn or explode when ignited.
Fill in the blank(s) with the appropriate word(s).
LEL
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Plant physiologists are responsible for studying and researching which of the following?
a. osmosis, nutrient uptake, translocation, respiration, photosynthesis, food movement, and food storage b. planting of new species of seeds, monitoring the irrigation of the seedlings, and weeding new species c. chemical composition of new herbicides d. chemical composition of new pesticides
Which type fire extinguisher may damage electronic components?
A) CO2 B) Dry chemical C) Both A and B D) Neither A nor B
The line that connects the evaporator to the compressor is called the:
A) Suction line. B) Discharge line. C) Liquid line. D) Condensate line.
Vertical heights parallel to the picture plane can be measured only on the picture plane
Indicate whether the statement is true or false