Which type of immunity means that the animal is more or less permanently immune to the disease?
a. Active immunity c. Passive immunity
b. Retroactive immunity d. Regressive immunity
A
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In agricultural buildings that require equipotential planes, the equipotential plane must be bonded to the grounding system with a bare or insulated solid copper wire no smaller than _____.
a. No 8 AWG b. No 6 AWG c. No 4 AWG d. No 3 AWG
Which of the following is an NEC Article 427 requirement for the installation of electrical heat-tracing cables on pipe and vessels in unclassified areas?
a. The external surfaces of any equipment that operates at temperatures above 100°F (38°C) must be physically guarded, isolated, or thermally protected. b. Branch circuits and overcurrent devices supplying the equipment must be sized at no less than 100 percent of the total heater load. c. The heating cable cannot be allowed to make direct contact with the pipe or vessel. d. The presence of electric heating equipment must be identified using permanent caution signs or markings at the specified intervals.
Because it is difficult for most manual welding to work with fractions smaller than ____ of an inch, these smaller dimensions are not commonly used in fabrication. When they are used, it is most often with some form of automated or machine welding or cutting process.
A. 1/16 B. 1/8 C. 1/4 D. 1/2
When transferring refrigerants from a cylinder to a refrigeration system or any other container, you should always wear ____.
A. goggles with side shields and gloves B. heavy protective clothing C. rubber gloves D. industrial steel-toed shoes and an insulated cap