【单选题】A 60-year-old woman developed left heart failure and died suddenly. A section from her heart at the time of autopsy reveals marked thickening of the wall of the left ventricle with decrease in cavity ...
【简答题】The
diagram shows a thick-walled tube. The thickness of the wall is 3mm. What is the internal diameter d of the tube?A. A. 2.8cm B. 3.1cm C. 3.4cm D. 7.4cm