What makes the lack of air exchange a problem is that concentrations of potentially harmful airborne
chemical are constantly introduced into indoor air. These chemicals are called ____.
a. volatile inorganic compounds c. sick building chemicals
b. volatile organic compounds d. inorganic harmful chemicals
B
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Explain how a guy derrick is used in multistory construction.
What will be an ideal response?
American newspapers in the post-Civil War era expanded their circulation and public attention by
A. printing hard-hitting editorials. B. crusading for social reform. C. investigative reporting that uncovered public corruption in local and state government. D. focusing on coverage of the local community and avoiding syndicalized material. E. printing sensationalist stories of sex and scandal.
How does an oil acid test kit indicate the presence of acid?
A) By a color change B) The word "acidic" appears on the test strip. C) The test kit produces a strong pungent odor. D) The liquid in the sample tube boils.
Explain the relationship between frequency and period.
What will be an ideal response?