已知长方形ABCD的长为10cm,宽为4cm,将长方形绕AD边所在直线旋转后形成一个什么立体图形?这个立体图形的体积是多少?
解:长方形绕AD边所在直线旋转后形成圆柱,
体积是:π×42×10=160π,
答:旋转后形成的立体图形是圆柱,体积是160π.
从下面方框中选择正确的单词并用其适当形式填空,使短文意思完整、通顺。
come, for, good, daughter, one, have, June, banana, when, we
Dear Jenny,
My name is Alan. I'm a 12-year- old girl. I'm the only ____ in my family. My birthday is on ____ 1st. It's the ____ day of the sixth month. It's also the Children's Day(儿童节). My parents ____ a party for me on that day. My friends ____ to the party. They bring(带来) me many birthday presents(礼物), and they sing Happy Birthday to me. ____ eat some strawberries, oranges and ____. We eat chicken and cakes ____ dinner. We also play games. We have a ____ time! How old are you? ____ is your birthday? Can you tell me?
Alan
【问题】氧化铝能不能做过氧化氢分解的催化剂?
【猜想】氧化铝能做过氧化氢分解的催化剂
满庭芳①
有王长官者,弃官黄州三十三年,黄人谓之王先生。因送陈慥来过余,因为赋此。
三十三年,今谁存者?算只君与长江。凛然苍桧,霜干苦难双。闻道司州古县,云溪上、竹坞松窗。江南岸,不因送子,宁肯过吾邦?
摐摐②,疏雨过,风林舞破,烟盖云幢。愿持此邀君,一饮空缸。居士先生老矣,真梦里、相对残釭③。歌声断,行人未起,船鼓已逢逢④。
【注】①本词创作于苏轼谪居黄州之时,当时朋友多怕受牵连而有意疏远,令他备感世态炎凉。②摐摐:形容雨声。③残釭:残灯。 ④逢逢:形容鼓声