It takes at least ___ bulb strokes to ensure that the rubber hose and top reservoir are thoroughly purged and filled with the fresh sample.

It takes at least ___ bulb strokes to ensure that the rubber hose and top reservoir are thoroughly purged and filled with the fresh sample.

It takes at least ___ bulb strokes to ensure that the rubber hose and top reservoir are thoroughly purged and filled with the fresh sample.




A. 20
B. 19
C. 18
D. 17
E. 16





Answer: C


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