方程xy'-ylny=0的通解为( )。A．y=ecx B．y=x C．y=e-x 发布时间：2018-01-17 07:52 │ 来源：www.tikuol.com 题型：单项选择题 问题： 方程xy'-ylny=0的通解为( )。A．y=ecxB．y=xC．y=e-xD．y=ex
题型：单项选择题 阅读理解。 There is a book shop near our school. Its name is Hanlin Bookshop. There are all kinds of books in it. It is open from nine in the morning to seven in the evening. On Sundays it is open from nine to five. It is closed（关闭的）in winter holidays(寒假).Jim and his father often go to the shop. His father always goes to the second floor. He likes to buy science books. Jim likes the books for children on the first floor. They sometimes go to the third floor to buy some computer books and CDs.根据短文的内容，完成下列的图表：Hanlin Bookshop Opening Hours Mon. - Sat 9:00 a.m. to ______ Sunday 9:00 a.m. to ______ Winter Holidays ___________ ______: 1st floor Science books : ___________ ___________: ____________ 查看答案
题型：单项选择题 某建设项目及其主要生产车间的有关费用见下表，则该生产车间新增固定资产价值为( )万元。 某项目及主要车间有关费用表 (单位：万元) 项 目 建筑工程费 设备安装费 需安装设备价值 土地征用费 建设项目竣工决算 1000 450 600 50 生产车间竣工决算 250 100 280 — A．645.37 B．830.00 C．642.50 D．792.70 查看答案