acerwx：
更正:①④兩個(gè)電源,開(kāi)機(jī)100次,平均14次不能啟動(dòng).②③兩個(gè)電源,均能順利啟動(dòng).示波器圖如下:電源①5V上升時(shí)間[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/47/1163736710.jpg');}"onmousewheel="returnimgzoom(this);">電源②5V上升時(shí)間[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/47/1163736823.jpg');}"onmousewheel="returnimgzoom(this);">電源③5V上升時(shí)間[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/47/1163736884.jpg');}"onmousewheel="returnimgzoom(this);">電源④5V上升時(shí)間[圖片]500){this.resized=true;this.width=500;this.alt='這是一張縮略圖，點(diǎn)擊可放大。\n按住CTRL，滾動(dòng)鼠標(biāo)滾輪可自由縮放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/47/1163737052.jpg');}"onmousewheel="returnimgzoom(this);">