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【单选题】
在电气化区段运行的机车、动车、车辆及自轮运转设备可以攀登到车顶或作业平台的梯子、天窗等处所，均应有（）的警告标志。A.
电气化区段禁止靠近
B.
电气化区段有电危险
C.
电气化区段严禁攀登
D.
电气化区段严禁接触
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皮皮学刷刷变学霸
举一反三
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【单选题】Great changes ______ in the city, and a lot of new buildings ______.A．have been taken place; hav
A.
15. Great changes ______ in the city, and a lot of new buildings ______. A．have been taken place; have been set up
B.
have taken place; have been set up
C.
have taken place; have set up
D.
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