To be classified as a ______________________, a substance must cause a significant increase in the rate of cancer in laboratory animals over that occurring in a nontreated control group
Fill in the blank(s) with correct word
carcinogen
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In the _____ method of picking up mortar, the amount of mortar to be picked up with the trowel is separated from the main pile on the mortar board.
A. cupping B. clock C. board D. quick
A switch called the ____________________ switch is used to connect the excitation current to the motor.
Fill in the blank(s) with the appropriate word(s).
The rate at which water will evaporate from the wick on the wet-bulb thermometer is determined by the moisture content of the surrounding air.
Answer the following statement true (T) or false (F)
Why should the heating element of a hot-surface igniter NOT be touched when installing a replacement igniter?
A) The igniter comes already charged and will deliver a painful shock. B) The igniter is very hot and will cause severe burns. C) The igniter will burn out where you touched it. D) Your hands will be in the way of the mounting screws, making it impossible to install.