Match each mineral to the disorder it helps prevent
a. calcium c. iron
b. iodine d. fluorine
12. rickets
13. anemia
14. goiter
15. poor teeth
12. ANS: A PTS: 1
13. ANS: C PTS: 1
14. ANS: B PTS: 1
15. ANS: D PTS: 1
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A straight or extension ladder should extend at least __________ above the top support when placed against a structure that is not as tall as the ladder.
a. 12 inches b. 18 inches c. 24 inches d. 36 inches
When differentiation of tissues begins, clones can be developed through embryo splitting
A. True B. False
Which of the following is a true statement?
a. Since shielding gases are not toxic, they do not represent a hazard of any kind. b. In confined spaces, pure oxygen is the best choice to ventilate the space and push out hazardous gases. c. Acetylene is heavier than air and collects in any depressed area when it is released. d. Manganese is a hazardous material found in stainless steel and in some filler metals.
A superconductor is
A) a conductor of electric charge that has sufficient cross-sectional area to make its resistance nearly zero. B) a conductor of electric charge that has zero resistance when subjected to very low temperatures. C) a conductor of electric charge that exhibits a negative resistance effect. D) a conductor of electric charge that exhibits zero resistance only in zero-gravity conditions.