问题
多项选择题
设备的发热现象是指非正常的温度或温升，并超出了通用技术要求。发热的主要原因有（）。
A、运动副的不正常运动
B、旋转机械的不正常
C、几何精度的超差
D、零部件的刚性变形
E、传动精度的超差
F、设备的功率降低
答案
参考答案：A, B, D
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设备的发热现象是指非正常的温度或温升，并超出了通用技术要求。发热的主要原因有（）。
A、运动副的不正常运动
B、旋转机械的不正常
C、几何精度的超差
D、零部件的刚性变形
E、传动精度的超差
F、设备的功率降低
参考答案：A, B, D
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A．calls in
B．calls up
C．calls on
D．calls for