分析:根據(jù)絕對(duì)值的特點(diǎn),即一個(gè)正數(shù)的絕對(duì)值是它本身,一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù),0的絕對(duì)值是0,進(jìn)行解答.
解答:解:A、絕對(duì)值等于3的數(shù)是-3和3,故本選項(xiàng)錯(cuò)誤;
B、絕對(duì)值小于1的整數(shù)是0、1和-1,故本選項(xiàng)錯(cuò)誤;
C、絕對(duì)值最小的有理數(shù)是0,故本選項(xiàng)錯(cuò)誤;
D、3的絕對(duì)值即|3|=3,故本選項(xiàng)正確;
綜上,D選項(xiàng)正確,
故選D選項(xiàng).
點(diǎn)評(píng):題主要考查了絕對(duì)值的性質(zhì),要求掌握絕對(duì)值的性質(zhì)及其定義,并能熟練運(yùn)用到實(shí)際運(yùn)算當(dāng)中.
絕對(duì)值規(guī)律總結(jié):一個(gè)正數(shù)的絕對(duì)值是它本身;一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù);0的絕對(duì)值是0.