Which of the following are true regarding a direct-acting cylinder valve?
I. It acts directly on the valve seat.
II. Turning the valve stem moves a diaphragm.
III. It is used on large cylinders (H or K).
IV. It is used on small cylinders (E)
A) I and III
B) I and IV
C) II and III
D) II and IV
C
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A laboratory technician is given a blood sample and asked to calculate the concentration of dopamine. The first test reveals that the concentration of dopamine falls outside the reliable range for the testing method. He adds 100 ?L saline solution to 100
A) The concentration in the diluted sample is one-half that of the original sample. B) The concentration in the diluted sample is one hundred times that of the original sample. C) The concentration in the diluted sample is one-tenth that of the original sample. D) The concentration in the diluted sample is twice that of the original sample.
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a. True b. False Indicate whether the statement is true or false