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问题 单项选择题

飞机上电网工作正常,若在电源控制面板上将ACESSFEED按钮弹出放ALTN位,则:

A、AC ESS BUS由应急发电机供电

B、AC ESS BUS由AC BUS 1供电

C、AC ESS BUS由AC BUS 2供电

D、不确定

答案

参考答案：C

单项选择题

Extreme Programming (XP) is a discipline of software development with (71) of simplicity, communication，feedback and courage．Successful software development is a team effort-not just the development team，but the larger team consisting of customer, management and developers．XP is a simple process that brings these people together and helps them to succeed together．XP is aimed primarily at object-oriented projects using teams of a dozen or fewer programmers in one location．The principles of XP apply to any (72) project that needs to deliver quality software rapidly and flexibly． An XP project needs a (73) customer to provide guidance．Customers，programmers， managers，are all working (74) to build the system that’s needed．Customers-those who have software that needs to be developed-will learn simple, effective ways to (75) what they need，to be sure that they are getting what they need，and to steer the project to success．

（73）处填（）。

A．part-time

B．casual

C．seldom

D．full-time
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单项选择题

我国经济电流密度最大负荷使用时间3000～5000h铜裸导线为( )A/mm2。

A．2.0
B．2.25
C．2.5
D．3
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