Please tell me ______what last year.
A. where does your sister work
B. where did your sister work
C. where your sister works
D. where your sister worked
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You must remember ________.
A. what your mother said
B. what did your mother say
C. your mother said what
D. what has your mother said
Did you know ____?
A. who he was looking after
B. who was he looking for
C. who he is looking for
D. who he is looking after
HXD3B型机车TCMS 显示屏上，受电弓的预选模式设有 （）类
A. 3
B. 4
C. 5
D. 6
HXD3B型机车机车设有主断粘连识别功能，即在主断闭合条件下，如果控制系统已发出断开主断 的命令，但是持续一定时间( )后主断仍处于闭合状态，控制系统将判断主断发生粘连并 立即执行降弓指令，相应的诊断信息如变流器停止运行、主断路器断开和受电弓降下等信 息将会产生。
A. 3s
B. 4s
C. 6s
D. 8s
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