【单选题】有节奏地交替显示不同颜色的灯光,其灯质为 。
【单选题】统万城()代地层普遍有一层灰烬、木炭块等是北宋毁废统万城的有力证据。
【单选题】春节想插一件丰满、端庄、喜庆的插花作品,宜选用哪种构图形式( )
【单选题】What does the passage imply about 'Homegrocer.com' and 'drugstore.com'?
A.
They are neither promising companies.
B.
They are affiliated to large companies.
C.
They are dealing in medical products.
D.
They are also affected by the economic crisis.
【单选题】根据以下资料回答题 已知某项目的现金流量情况如下表所示(单位:万元): 年份净现金流量累计净现金流量1—3000 21000—200031500—50041500 求该项目第4年的累计净现金流量是( )万元。