举例说明阳性花卉、阴性花卉、中性花卉的特点(每类至少3-5种)。
下列关于燃气管道补偿器安装的说法,错误的是()。
A. 安装在阀门的下侧
B. 安装在架空管道上
C. 应便于阀门的拆卸和检修
D. 填料补偿器支座导向应防止运行时自由伸缩
Reduced voltage applied to a motor during the starting period will ().
A. result in decreased acceleration time only
B. lower the starting current and increase accelerating time
C. cause a greater starting torque
D. increase the starting current and pump capacity
在调车作业中推进车辆运行时,前方进路的确认由调车指挥人负责。
A. 正确
B. 错误