下列做法中，减小摩擦的是

下列做法中，减小摩擦的是（　　）

　 A．短跑运动员穿上钉鞋 B．自行车刹车时，用力握手闸

C．车轮胎上有凹凸不平的花纹 D．行李箱底部安装滚轮

答案

相关题目

The ____________ shoes were covered with mud, so I asked them to take them off

The ____________ shoes were covered with mud, so I asked them to take them off before they got into __________ car. A. girl’s; Tom’s B. girls’; Toms’ C. girls’; Tom’s �

We arrived at the station too early and had __ __ to go，so we sat there and c

We arrived at the station too early and had __ __ to go，so we sat there and chatted with each other. A．somewhere B．anywhere C．everywhere D．nowhere

20世纪90年代末期，我国城镇居民人均文化消费支出约400元左

20世纪90年代末期，我国城镇居民人均文化消费支出约400元左右，比80年代视增长了近十倍。2001年则达到650元。城镇居民文化消费支出增长的根本原因是A

我们每天所吃的食物中，有些营养物质需要消化后才能被吸

我们每天所吃的食物中，有些营养物质需要消化后才能被吸收利用。那么，消化和吸收的主要场所是() A.大肠 B.小肠 �

— You’ve given us a wonderful English dinner, Mrs.Smith. — ____. A. Oh,

— You’ve given us a wonderful English dinner, Mrs.Smith. — ____. A. Oh, I’m afraid I didn’t cook very well B. I’m glad you enjoyed it C. Come again when you are free D. It’s not

今年央视“3·15”特别节目曝光，某品牌肉制品中含有毒物质

今年央视“3·15”特别节目曝光，某品牌肉制品中含有毒物质瘦肉精。某种瘦肉精的化学式为C10H19Cl3N2O，下列有关该瘦肉精的说法中正确的是 A. 瘦肉

“尊号”是中国古代为封建君王加的全由尊崇褒美之词组成

“尊号”是中国古代为封建君王加的全由尊崇褒美之词组成的特殊称号，或生前所上，或死后追加，含有对君主事迹的评定。在以下古代帝王的尊号中

Every December the radio station in my city makes a program in which all the po

Every December the radio station in my city makes a program in which all the poor children can send letters asking for some Christmas presents. One day, as I was 41 the radio, I decided to do

下列做法中，减小摩擦的是

答案

相关题目

最新题目