qc: that is, quality control, product, quality control. Each company's responsibilities are different, broadly speaking, including all the process control from the original material to the finished product, responsible for the entire production line
QC: and quality control is similar, some companies qc is quality control. In fact, I think the quality control emphasizes the supervision and inspection of system documents. There is still a difference in the work content with qc
Quality inspector: and qc, quality control has cross. But the position is relatively clear, mainly responsible for quality inspection, generally on-site inspection work, to prevent substandard products into the market
In short: different companies have slightly different definitions, large companies distinguish between fine, small companies may be a person full of both.