There are ____________________ essential elements needed for plant growth
Fill in the blank(s) with correct word
17
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Which of the following statements about hydrogen is true?
A. A hydrogen atom is one proton and two electrons. B. Hydrogen is one of the heaviest elements known and is full of energy. C. Fossil fuels are combinations of carbon and hydrogen. D. Hydrogen is produced in a fuel cell when water is broken down into its basic elements.
What is the purpose of the crankcase heater?
What will be an ideal response?
Identify the INCORRECT procedure when charging and air conditioning system with a manifold gauge set and an accurate weigh scale.
A. Purge the yellow service hose from the refrigerant cylinder to the manifold. B. Charge using liquid refrigerant through the red high pressure hose. C. Finish charging with vaporous refrigerant through the blue low pressure hose with the vehicles compressor running until the correct charge by weight is installed. D. Finish charging with liquid refrigerant through the blue low pressure hose with the vehicles compressor running until the correct charge by weight is installed.
A ratio expressed in percentage of the amount of moisture present in the air to the amount it can hold at
saturation is called _____. a. dew point b. specific humidity c. specific gravity d. relative humidity