请问Step-Down Switching Regulator 什么意思?谢谢

请问Step-Down Switching Regulator 什么意思?谢谢 Single-OUT Step Down step down with step out,step down,step up,step back 这四个短语是不是有? step down 要不要加s step they are in Abidjan to press their demands that Gbagbo step down 请问down 请问一下step什么意思 Libyan UN diplomats say Gadhafi should step down,求翻译, STEP 请问 step by step 听力入门一 和step by step 2000 和3000有什么区别哦 请问sound和step的过去式是什么 请问Sit-down Restaurant I can't step down off of my tallness什么意思I can't step down off of my tallness.Yeah go ahead,keep moving.let'sstepdownoffoftallnessyeahgo aheadkeep 英语四级听力 step by step有用嘛?请问step by step对四级英语听力有帮助吗?应该听第几册啊? step by step 2000 book4 请问谁有step by step 2000 第四册的听力文本或者听力答案的.感激不尽 One step to calming down is recognizing you have this tendency.为什么是calming down ing形式? 请问,英语听力材料,step by step 2000和3000的区别,听哪一个比较好, 请问eclipse中debug的Step Into和Step Over有什么区别?