国民经济评价采用根据机会成本和供求关系确定的影子价格。
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办理引导进路锁闭时,故障区段的道岔单操按钮如未拉出,引导过程中若区段故障自动恢复,该区段的道岔会解锁。
A. 正确
B. 错误
在向有中间出岔的股道排接车进路时,用道岔锁闭继电器CSJ的再吸起证明咽喉区最末一个道岔区已经正常解锁。
A. 正确
B. 错误
A system administrator has added a new port entry in /etc/services for a new application to be tested. Which of the following commands should be used to activate this port?()
A. telinit -q
B. refresh -s inetd
C. startsrc -g services
D. refresh -s portma