设f(x,y)为连续函数,改变为极坐标的累次积分为=______. 发布时间:2017-01-26 15:58 │ 来源:www.tikuol.com 题型:填空题 问题: 设f(x,y)为连续函数,改变为极坐标的累次积分为[*]=______.
题型:填空题 To keep the air clean, this hospital forbids all the patients _____ in and around it.A. to smoke B. smokingC. to be smoking D. smoked 查看答案