Model JO415 DC microammeter is suitable for students to measure weak current and slimelectric potenial in laboratory of middle school and polytechnic school.
AC Milliammeter, Model J0414, is suitable for the laboratories of middle schools and polytechnic schools to measure current intensity in the AC circuit.
Objective To understand the carriable condition and categories of enteric pathogenic Salmonella and Shigella in high school students in the disease prevalent seasons.
As a schoolboy with an avid interest in birds, David Wingate was present in 1951 when a Bermudan naturalist succeeded in weaseling the first cahow out of its deep nesting crevice.