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【单选题】
PNX系列铁路信号智能电源屏欠压阀值的调整范围为( ): ( U为输入电源的电压值)A.
0.7U～0.9U
B.
0.7U～0.95U
C.
0.6U～0.9U
D.
0.6U～0.8U
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【判断题】车削外圆时,如果刀尖安装高于工件的回转轴线,则实际工作前角<理论车刀前角。< /div>
A.
正确
B.
错误
【单选题】Which of the lb]lowing statements is in accordance with what the interviewee says about the exams for entering college in the United States?
A.
Neither of the two national exams is compulsory.
B.
Either of the two national exams is compulsory.
C.
Both of the two national exams are compulsory.
D.
They are not required by any school in the United States.
相关题目：
【判断题】车削外圆时,如果刀尖安装高于工件的回转轴线,则实际工作前角<理论车刀前角。< /div>
A.
正确
B.
错误