BUK9209 BUK9209-40B BUK9209-40B MOS(场效应管) BUK9209-40B,118 BUK9209-40B+118 BUK9209-40B118 BUK9209-40B-VB BUK9212-55B BUK9212-55B,118 BUK9212-55B+118