某高速公路项目,年车辆收费收入600万元,旅客时间节约价值800万元,运输费用节省200万元,进行经济费用效益分析时,在不考虑其他因素的情况下,该项目的年经济效益流量应为()万元。(2009年第47题)
A. 400
B. 600
C. 1000
D. 1600
The following suggestions increase program's(73)and make them easier to(74):
Use a standard indention technique, blank lines, form. feeds, and spaces.
Insert plenty of comments into your code.
A. security
B. reliability
C. readability
D. usability
In the Ethernet LAN, an algorithm was chosen to dynamically adapt to the number of stations trying to send. It is caned(71).
A. backward learning
B. binary exponential backoff
C. spaanning tree
D. CRC
某商场的部门、员工和商品3个实体之间的关系如图3-6所示。假设每个部门有若干名员工,每种商品只能由一个部门负责销售,那么部门到员工、部门到商品之间分别存在(61)的联系。
图3-6 某实体关系图
A. 1:1和1:1
B. 1:1和1:n
C. 1:n和1:1
D. 1:n和1:n