Describe the five major disease-causing organisms. Of these, which causes the most serious problem?
What will be an ideal response?
? The major disease-causing organisms in forests are fungi, nematodes, bacteria, viruses, and mistletoes.
? The most important of these are fungi
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What should the technician keep in mind when troubleshooting electronically controlled igniters?
a. The system increases igniter voltage when the gas fails to ignite. b. The system increases igniter current when the gas fails to ignite. c. The system starts the blower when the gas fails to ignite. d. The system locks out the ignition circuit when the gas fails to ignite.
One way to troubleshoot a(n) ____________________ on a heating and cooling system is to first turn the fan selector switch to the FAN ON position and see if the fan starts.
Fill in the blank(s) with the appropriate word(s).
Refer to Exercise 12. Let Z=X+Y represent the total number of repairs needed.
a. Find 
.
b. Find 
.
c. Find P(Z=2).
The main purpose of the receiver tank is:
A. To subcool refrigerant. B. To superheat refrigerant. C. To store refrigerant. D. To filter refrigerant.