What is the sampling method used in research that involve selecting the same percentage of groups of participants, such as the same percentage of republicans and democrats?
A) ?Quota sample
B) ?Stratified random sample
C) ?Systomatic random sample
D) ?Cluster sample
A
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Which of the following sets a basis for classification of flammability of liquids?
A) NFPA 30 B) NFPA 72 C) NFPA 921 D) NFPA 101
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____, such as mustard gas, are heavy, oily liquids that are colorless and odorless in their pure state.
A. Irritants B. Blister agents C. Nerve agents D. Blood agents
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Class K agents are usually ____, consisting of potassium carbonate-based chemical, potassium acetate-based chemical, potassium citrate-based chemical, or a combination.
A. wet chemicals B. dry chemicals C. dry powders D. wet powders
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How many pulmonary veins empty into the left atrium?
A. 8 B. 4 C. 2 D. 0
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