【单选题】
升弓手信号在夜间的显示方式为白色灯光作___。 J445
A. 圆形转动
B. 左右重复摇动
C. 上下摇动
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答案
A
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【单选题】
制动机进行简略试验时，自阀减压___kPa并保压1min，检查制动主管贯通状态，司机检查制动主管漏泄量，每分钟不得超过20kPa。 C15
A. 50
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___信号机及线路所通过信号机，因受地形.地物影响，达不到规定的显示距离时，应设复示信号机。 J85
A. 进站、出站、进路
B. 进站、进路、发车进路
C. 进站、出站、通过
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