单选题下列图形中，是轴对称图形而不是中心对称图形的是A.圆B.正方形C.矩形D.正三角

单dān选题tí下xià列liè图tú形xíng中zhōng，是shì轴zhóu对duì称chēng图tú形xíng而不bù是shì中zhōng心xīn对duì称chēng图tú形xíng的de是shì

A.圆yuánB.正zhèng方形xíngC.矩jǔ形xíngD.正zhèng三sān角形xíng,

D解jiě析xī分fēn析xī：根gēn据轴zhóu对duì称chēng图tú形xíng与yǔ中zhōng心xīn对duì称chēng图tú形xíng的de概gài念niàn求qiú解jiě．如果guǒ一yī个gè图tú形xíng绕某一yī点diǎn旋xuán转zhuǎn180°后hòu能够gòu与yǔ自zì身shēn重zhòng合hé，那nà么me这个gè图tú形xíng就jiù叫做zuò中zhōng心xīn对duì称chēng图tú形xíng，这个gè点diǎn叫做zuò对duì称chēng中zhōng心xīn．如果guǒ一yī个gè图tú形xíng沿yán一yī条tiáo直线xiàn折zhé叠dié，直线xiàn两liǎng旁的de部bù分fēn能够gòu互hù相xiāng重zhòng合hé，那nà么me这个gè图tú形xíng叫做zuò轴zhóu对duì称chēng图tú形xíng．解jiě答dá：A、是shì轴zhóu对duì称chēng图tú形xíng，也yě是shì中zhōng心xīn对duì称chēng图tú形xíng，不bù符fú合hé题tí意yì；B、是shì轴zhóu对duì称chēng图tú形xíng，也yě是shì中zhōng心xīn对duì称chēng图tú形xíng，不bù符fú合hé题tí意yì；C、是shì轴zhóu对duì称chēng图tú形xíng，也yě是shì中zhōng心xīn对duì称chēng图tú形xíng，不bù符fú合hé题tí意yì；D、是shì轴zhóu对duì称chēng图tú形xíng，不bù是shì中zhōng心xīn对duì称chēng图tú形xíng，符fú合hé题tí意yì．故选D．点diǎn评：掌zhǎng握wò中zhōng心xīn对duì称chēng图tú形xíng与yǔ轴zhóu对duì称chēng图tú形xíng的de概gài念niàn．判断duàn轴zhóu对duì称chēng图tú形xíng的de关guān键jiàn是shì寻xún找zhǎo对duì称chēng轴zhóu，图tú形xíng两liǎng部bù分fēn沿yán对duì称chēng轴zhóu折zhé叠dié后hòu可kě重zhòng合hé；判断duàn中zhōng心xīn对duì称chēng图tú形xíng是shì要寻xún找zhǎo对duì称chēng中zhōng心xīn，图tú形xíng旋xuán转zhuǎn180度dù后hòu与yǔ原yuán图tú形xíng重zhòng合hé．