题目

一个长为7cm，宽为3cm的长方形，以长为轴旋转一周，将会得到一个体积是________cm3的圆柱体。 答案：【答案】197.82【解析】根据题意，以长方形的长为轴旋转一周，可以得到一个圆柱，圆柱的底面半径是长方形的宽，圆柱的高是长方形的长，然后用公式：V=πr2h，据此列式解答.3.14×32×7=3.14×9×7=28.26×7=197.82（cm3）故答案为：197.82 。7．听第四段对话，回答第8-10题．8．Which is NOT the purpose of divers going down into the sea？A．Drawing some maps about the dangerous sea area．B．Looking for ships containing gold and jewelsC．Trying to bring the ships to the surface．9．Which is TRUE about"Lusitania"？A．It's an expensive ship made in Ireland．B．John Light is its current owner．C．It sank on its first voyage．10．Why does the man buy the ship？A．He wants to make use of its parts．B．He used to be a passenger on the ship．C．He wants to make money from the ship．